Orbital Analysis for matched events on 20210816_222726.393_UK

Summary for Event
-----------------
shower ID 12 KCG
Lg 304.49° Bg 71.32° Vg 22.94km/s
mass 0.04452g, abs. mag 1.0
Path Details
------------
start -2.61° 51.63° 93.65km
end   -2.59° 51.63° 84.15km

Orbit Details
-------------
Semimajor axis 4.18A.U., eccentricity 0.77, inclination 34.30°, Period 8.54Y, LA Sun 143.97°, last Perihelion 2013-02-19

Full details below
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Detailed report below graphs

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Input measurement type: Azimuth +east of due north for meas1, Elevation angle above the horizon for meas2

Uncertainties type:
 Purely geometric uncertainties

Reference JD: 2459443.435722148046
Time: 2021-08-16 22:27:26.420990 UTC


Plane intersections
-------------------
Intersection 1 - Stations: UK0006 and UK000S
 Convergence angle = 81.96933 deg
 R.A. = 288.15670  Dec = +49.74514 deg
Intersection 2 - Stations: UK0006 and UK001Z
 Convergence angle = 47.79274 deg
 R.A. = 288.82421  Dec = +49.97672 deg
Intersection 3 - Stations: UK000S and UK001Z
 Convergence angle = 50.23992 deg
 R.A. = 288.58751  Dec = +49.36620 deg

Best intersection: Stations UK0006 and UK000S with Qconv = 81.97 deg


Least squares solution
----------------------
State vector (ECI, epoch of date):
 X =   1999855.76 +/- 25.05 m
 Y =  -3494420.90 +/- 37.06 m
 Z =   5051064.11 +/- 50.56 m
 Vx =     4822.91 +/- 115.33 m/s
 Vy =   -15663.72 +/- 7.54 m/s
 Vz =    19519.30 +/- 216.75 m/s

State vector covariance matrix (X, Y, Z, Vx, Vy, Vz):
+6.812439e+02, -5.443119e+02, -3.134525e+02, +1.552031e+03, +4.798898e+02, -3.529630e+03
-5.443119e+02, +1.467123e+03, -4.022674e+02, -6.142777e+02, +4.933384e+02, +4.788302e+03
-3.134525e+02, -4.022674e+02, +2.658179e+03, -9.033687e+02, -4.424682e+01, +6.885250e+03
+1.552031e+03, -6.142777e+02, -9.033687e+02, +4.855146e+03, +2.187868e+03, -7.490413e+03
+4.798898e+02, +4.933384e+02, -4.424682e+01, +2.187868e+03, +2.022928e+03, +2.924543e+01
-3.529630e+03, +4.788302e+03, +6.885250e+03, -7.490413e+03, +2.924543e+01, +4.686105e+04

Timing offsets (from input data):
    UK0006: -0.000657 s
    UK000S: -0.000263 s
    UK001Z: 0.000000 s

Reference point on the trajectory:
  Time: 2021-08-16 22:27:26.420990 UTC
  Lon     = +-2.606890 +/- 0.0003 deg
  Lat     = +51.626280 +/- 0.0004 deg
  Lat geo = +51.441575 +/- 0.0004 deg
  Ht      =   94298.91 +/- 48.78 m

  JD dynamic   = 2459443.436523206066 
  LST apparent = 299.7824897521 deg
Radiant (apparent in ECI which includes Earth's rotation, epoch of date):
  R.A.      = 287.11378 +/- 0.2527 deg
  Dec       = +49.98147 +/- 0.3347 deg
  Azimuth   = 263.35470 +/- 2.2634 deg
  Elevation = +81.83756 +/- 0.1639 deg
  Vavg      =  23.86722 +/- 0.0652 km/s
  Vinit     =  25.48756 +/- 0.1566 km/s
Radiant (apparent ground-fixed, epoch of date):
  R.A.      = 288.11903 +/- 0.2527 deg
  Dec       = +50.08816 +/- 0.3347 deg
  Azimuth   = 262.76963 +/- 2.2634 deg
  Elevation = +82.48712 +/- 0.1639 deg
  Vavg      =  23.82748 +/- 0.0652 km/s
  Vinit     =  25.44782 +/- 0.1566 km/s
Radiant (geocentric, J2000):
  R.A.   = 286.33089 +/- 0.2621 deg
  Dec    = +49.83326 +/- 0.3541 deg
  Vg     =  22.93909 +/- 0.1742 km/s
  Vinf   =  25.48756 +/- 0.1566 km/s
  Zc     =   8.14312 +/- 0.1622 deg
  Zg     =   8.57238 +/- 0.1722 deg
Radiant (ecliptic geocentric, J2000):
  Lg     = 304.49213 +/- 0.5198 deg
  Bg     = +71.32062 +/- 0.3541 deg
  Vh     =  39.24313 +/- 0.0841 km/s
Radiant (ecliptic heliocentric, J2000):
  Lh     = 246.81339 +/- 0.1132 deg
  Bh     = +33.62462 +/- 0.3041 deg
  Vh_x   =  12.86586 +/- 0.0603 km/s
  Vh_y   =  30.03768 +/- 0.0837 km/s
  Vh_z   = -21.73086 +/- 0.2100 km/s
Orbit:
  La Sun = 143.969523 +/- 0.0000 deg
  a      =   4.177848 +/- 0.1386 AU
  e      =   0.767227 +/- 0.0070
  i      =  34.296689 +/- 0.2986 deg
  peri   = 204.626083 +/- 0.4063 deg
  node   = 143.975070 +/- 0.0001 deg
  Pi     = 348.601153 +/- 0.4063 deg
  q      =   0.972492 +/- 0.0011 AU
  f      = 335.367293 +/- 0.4063 deg
  M      = 357.861838 +/- 0.1330 deg
  Q      =   7.383205 +/- 0.2762 AU
  n      =   0.115418 +/- 0.0053 deg/day
  T      =   8.539445 +/- 0.4321 years
  Last perihelion JD = 2456342.875142 (2013-02-19 09:00:12.283780) +/- 158.1370 days
  Tj     =   2.195166 +/- 0.0388
Shower association:
  IAU No.  =   12
  IAU code =  KCG

Orbit covariance matrix:
             e     ,     q (AU)   ,      Tp (JD) ,   node (rad) ,   peri (rad) ,    i (rad)
e   , +5.426082e-05, +7.926637e-06, -1.225512e+00, -5.591835e-09, -5.167479e-05, +2.674381e-05
q   , +7.926637e-06, +1.345951e-06, -1.795624e-01, -1.064620e-09, -8.564015e-06, +5.091032e-06
Tp  , -1.225512e+00, -1.795624e-01, +2.773298e+04, +1.262171e-04, +1.170114e+00, -6.037888e-01
node, -5.591835e-09, -1.064620e-09, +1.262171e-04, +1.216353e-12, +6.662306e-09, -5.799529e-09
peri, -5.167479e-05, -8.564015e-06, +1.170114e+00, +6.662306e-09, +5.469414e-05, -3.186046e-05
i   , +2.674381e-05, +5.091032e-06, -6.037888e-01, -5.799529e-09, -3.186046e-05, +2.765371e-05

Jacchia fit on lag = -|a1|*exp(|a2|*t):
 a1 = 3.052400
 a2 = 12.277851

Mean time residuals from time vs. length:
  Station with reference time: UK001Z
  Avg. res. = 3.983e-06 s
  Stddev    = 2.00e-03 s

Begin point on the trajectory:
  Lon =    -2.605583 +/- 0.0003 deg
  Lat =    51.626375 +/- 0.0003 deg
  Ht  = 93654.46 +/- 37.21 m
End point on the trajectory:
  Lon =    -2.587961 +/- 0.0002 deg
  Lat =    51.627773 +/- 0.0002 deg
  Ht  = 84148.76 +/- 20.17 m

Stations
--------
        ID, Ignored, Lon +E (deg), Lat +N (deg),  Ht (m), Jacchia a1, Jacchia a2,  Beg Ht (m),  End Ht (m), +/- Obs ang (deg), +/- V (m), +/- H (m), Persp. angle (deg), Weight, FOV Beg, FOV End, Comment
    UK0006,   False,    -1.306160,    51.883100,   80.00,   1.520074,  13.925409,    91905.72,    84364.88,          0.023305,     46.91,     22.80,              37.09, 0.3638,    True,    True, {"ff_name": "FF_UK0006_20210816_222718_021_0214016.fits"}
    UK000S,   False,    -1.778230,    50.857470,   24.00,   2.145478,  13.277286,    93654.46,    84148.76,          0.014289,     34.48,      2.58,              44.54, 0.4919,    True,    True, {"ff_name": "FF_UK000S_20210816_222725_423_0213760.fits"}
    UK001Z,   False,    -2.949729,    50.877448,   82.00,   5.874622,  10.494499,    91284.38,    84561.03,          0.018741,     39.07,     11.72,              46.27, 0.5222,    True,    True, {"ff_name": "FF_UK001Z_20210816_222726_261_0211968.fits"}

Points
------
 No, Station ID,  Ignore,  Time (s),                   JD,     meas1,     meas2, Azim +E of due N (deg), Alt (deg), Azim line (deg), Alt line (deg), RA obs (deg), Dec obs (deg), RA line (deg), Dec line (deg),       X (m),       Y (m),       Z (m), Latitude (deg), Longitude (deg), Height (m),  Range (m), Length (m), State vect dist (m),  Lag (m), Vel (m/s), Vel prev avg (m/s), H res (m), V res (m), Ang res (asec), AppMag, AbsMag
  0,     UK0006,       1,  0.051725, 2459443.435722757597, 251.90635,  24.52669,              252.90905,  43.92442,       252.83659,       43.92683,    251.90635,     +24.52669,     251.95196,      +24.49469,  1999543.68, -3493407.35,  5049801.08,      51.626520,       -2.603685,   92666.40,  132451.37,       0.00,             1649.22,   388.76,      0.00,           21981.71,     52.79,    108.62,         188.07,  +4.93,  +4.32
  1,     UK0006,       0,  0.091925, 2459443.435723222792, 251.81085,  24.33409,              252.82791,  43.72138,       252.82568,       43.72145,    251.81085,     +24.33409,     251.81263,      +24.33311,  1999398.27, -3492935.09,  5049212.58,      51.626632,       -2.602310,   91905.72,  131848.54,     768.45,             2417.66,   132.61,  19115.57,           21981.71,      1.62,      3.33,           5.79,  +1.54,  +0.94
  2,     UK0006,       0,  0.132141, 2459443.435723688453, 251.62251,  24.16192,              252.85494,  43.47900,       252.81258,       43.48042,    251.62251,     +24.16192,     251.64978,      +24.14313,  1999228.90, -3492385.01,  5048527.10,      51.626762,       -2.600680,   91019.69,  131147.22,    1663.52,             3312.73,     2.67,  22256.57,           21981.71,     30.79,     63.35,         110.77,  +1.70,  +1.11
  3,     UK0006,       0,  0.172393, 2459443.435724154115, 251.46871,  23.93161,              252.79789,  43.21245,       252.79789,       43.21245,    251.46871,     +23.93161,     251.46943,      +23.93161,  1999042.47, -3491779.52,  5047772.57,      51.626906,       -2.598868,   90044.38,  130377.14,    2648.76,             4297.97,   -38.01,  24476.86,           21981.71,     -0.00,     -0.01,           0.02,  +1.68,  +1.10
  4,     UK0006,       0,  0.212645, 2459443.435724620242, 251.28398,  23.71544,              252.78402,  42.93825,       252.78297,       42.93829,    251.28398,     +23.71544,     251.28554,      +23.71498,  1998853.95, -3491167.25,  5047009.59,      51.627051,       -2.597034,   89058.16,  129601.29,    3645.02,             5294.24,   -67.68,  24750.64,           22794.71,      0.76,      1.56,           2.76,  +1.13,  +0.57
  5,     UK0006,       0,  0.252921, 2459443.435725086369, 251.04947,  23.49628,              252.81597,  42.63221,       252.76633,       42.63387,    251.04947,     +23.49628,     251.08219,      +23.47407,  1998647.01, -3490495.15,  5046172.05,      51.627210,       -2.595004,   87975.54,  128752.28,    4738.65,             6387.87,    -0.58,  27153.41,           23650.28,     35.91,     73.89,         131.62,  +0.96,  +0.41
  6,     UK0006,       0,  0.293137, 2459443.435725551564, 250.89715,  23.30937,              252.79835,  42.39918,       252.75427,       42.40066,    250.89715,     +23.30937,     250.92659,      +23.28961,  1998490.85, -3489987.98,  5045540.04,      51.627330,       -2.593512,   87158.57,  128116.01,    5563.90,             7213.12,  -200.34,  20520.45,           23620.47,     31.85,     65.53,         117.31,  +1.00,  +0.46
  7,     UK0006,       0,  0.333425, 2459443.435726018157, 250.72372,  23.04893,              252.73797,  42.09710,       252.73802,       42.09710,    250.72372,     +23.04893,     250.72508,      +23.04895,  1998289.23, -3489333.17,  5044724.06,      51.627485,       -2.591537,   86103.79,  127295.36,    6629.38,             8278.60,  -161.70,  26446.64,           23843.87,     -0.04,     -0.07,           0.13,  +0.90,  +0.38
  8,     UK0006,       0,  0.373665, 2459443.435726483818, 250.53604,  22.84686,              252.74256,  41.83123,       252.72427,       41.83184,    250.53604,     +22.84686,     250.54941,      +22.83861,  1998115.46, -3488768.80,  5044020.76,      51.627619,       -2.589857,   85194.65,  126592.05,    7547.72,             9196.93,  -268.99,  22821.41,           23879.92,     13.18,     27.11,          49.12,  +0.63,  +0.12
  9,     UK0006,       0,  0.413889, 2459443.435726949479, 250.35402,  22.66650,              252.76102,  41.58523,       252.71188,       41.58687,    250.35402,     +22.66650,     250.38753,      +22.64428,  1997956.86, -3488253.71,  5043378.88,      51.627741,       -2.588338,   84364.88,  125953.25,    8385.86,            10035.08,  -456.05,  20836.92,           23732.39,     35.35,     72.73,         132.43,  +1.66,  +1.16
 10,     UK0006,       1,  0.454061, 2459443.435727414209, 250.23139,  22.52055,              252.75293,  41.40062,       252.70323,       41.40228,    250.23139,     +22.52055,     250.26551,      +22.49805,  1997838.96, -3487870.82,  5042901.74,      51.627832,       -2.587251,   83748.02,  125481.99,    9008.89,            10658.11,  -856.91,  15509.08,           23278.89,     35.72,     73.50,         134.33,  +5.41,  +4.92
  0,     UK000S,       0,  0.027088, 2459443.435722465161, 201.82528,  65.12597,              326.26695,  41.53487,       326.28783,       41.53774,    201.82528,     +65.12597,     201.81052,      +65.14058,  1999732.56, -3494020.79,  5050565.51,      51.626375,       -2.605583,   93654.46,  139924.46,       0.00,              651.05,    18.54,      0.00,           25308.94,     -2.89,    -38.70,          57.21,  +4.43,  +3.70
  1,     UK000S,       0,  0.067364, 2459443.435722931288, 201.14472,  64.97085,              326.30834,  41.21004,       326.36016,       41.21713,    201.14472,     +64.97085,     201.10714,      +65.00709,  1999518.97, -3493327.10,  5049701.07,      51.626539,       -2.603485,   92537.13,  139122.28,    1128.75,             1779.80,   120.76,  28025.49,           25308.94,     -7.19,    -95.94,         142.64,  +2.88,  +2.16
  2,     UK000S,       0,  0.107596, 2459443.435723396949, 200.55636,  64.88561,              326.40176,  40.95613,       326.41690,       40.95821,    200.55636,     +64.88561,     200.54554,      +64.89619,  1999348.51, -3492773.49,  5049011.20,      51.626670,       -2.601844,   91645.42,  138486.33,    2029.57,             2680.62,    -3.85,  22390.47,           25308.94,     -2.09,    -28.00,          41.81,  +2.75,  +2.04
  3,     UK000S,       0,  0.147868, 2459443.435723863076, 199.88331,  64.75782,              326.47967,  40.64817,       326.48513,       40.64892,    199.88331,     +64.75782,     199.87977,      +64.76164,  1999146.73, -3492118.14,  5048194.54,      51.626825,       -2.599870,   90589.83,  137736.38,    3095.92,             3746.97,    36.07,  26478.86,           25308.94,     -0.75,    -10.09,          15.16,  +2.49,  +1.79
  4,     UK000S,       0,  0.188096, 2459443.435724328738, 199.32741,  64.63783,              326.53208,  40.38500,       326.54165,       40.38631,    199.32741,     +64.63783,     199.32077,      +64.64452,  1998977.32, -3491567.92,  5047508.88,      51.626956,       -2.598239,   89703.55,  137110.72,    3991.23,             4642.28,   -93.93,  22255.78,           24718.53,     -1.32,    -17.68,          26.67,  +2.23,  +1.54
  5,     UK000S,       0,  0.228408, 2459443.435724795330, 198.57383,  64.48841,              326.62251,  40.03526,       326.61850,       40.03471,    198.57383,     +64.48841,     198.57798,      +64.48561,  1998752.52, -3490837.85,  5046599.11,      51.627129,       -2.596020,   88527.57,  136283.55,    5179.18,             5830.23,    66.56,  29468.97,           25229.45,      0.55,      7.41,          11.25,  +2.00,  +1.33
  6,     UK000S,       0,  0.268664, 2459443.435725260992, 197.95958,  64.35481,              326.68824,  39.74262,       326.68094,       39.74162,    197.95958,     +64.35481,     197.96662,      +64.34971,  1998567.42, -3490236.68,  5045849.96,      51.627271,       -2.594221,   87559.20,  135607.29,    6157.39,             6808.44,    18.74,  24299.63,           25312.20,      1.01,     13.47,          20.55,  +2.14,  +1.48
  7,     UK000S,       0,  0.308864, 2459443.435725726653, 197.49262,  64.23991,              326.72719,  39.51172,       326.72821,       39.51186,    197.49262,     +64.23991,     197.49307,      +64.24063,  1998423.86, -3489770.43,  5045268.94,      51.627382,       -2.592863,   86808.12,  135086.42,    6916.07,             7567.12,  -247.18,  18872.59,           24810.91,     -0.14,     -1.89,           2.89,  +1.81,  +1.16
  8,     UK000S,       0,  0.349136, 2459443.435726192780, 196.85055,  64.10112,              326.80456,  39.20522,       326.79305,       39.20364,    196.85055,     +64.10112,     196.86164,      +64.09309,  1998232.64, -3489149.39,  5044495.04,      51.627529,       -2.590998,   85807.74,  134394.49,    7926.59,             8577.64,  -263.09,  25092.50,           24595.66,      1.58,     21.19,          32.61,  +1.44,  +0.80
  9,     UK000S,       0,  0.389388, 2459443.435726658441, 196.28369,  63.94628,              326.84389,  38.91421,       326.85274,       38.91542,    196.28369,     +63.94628,     196.27779,      +63.95244,  1998055.69, -3488574.69,  5043778.88,      51.627665,       -2.589284,   84881.97,  133758.12,    8861.73,             9512.78,  -353.88,  23231.99,           24411.70,     -1.22,    -16.28,          25.17,  +2.04,  +1.41
 10,     UK000S,       0,  0.429588, 2459443.435727123637, 195.80747,  63.84320,              326.90713,  38.68595,       326.89895,       38.68482,    195.80747,     +63.84320,     195.81631,      +63.83751,  1997915.55, -3488119.56,  5043211.72,      51.627773,       -2.587961,   84148.76,  133257.66,    9602.31,            10253.36,  -637.90,  18422.42,           24039.54,      1.13,     15.04,          23.34,  +3.54,  +2.92
  0,     UK001Z,       1,  0.000000, 2459443.435722148046,  44.32223,  78.73824,               16.01087,  46.82029,        15.89516,       46.80560,     44.32223,     +78.73824,      44.57437,      +78.80208,  1999868.56, -3494462.49,  5051115.94,      51.626270,       -2.606911,   94365.89,  128506.28,       0.00,               67.67,   125.56,      0.00,           25948.22,    -52.00,   -172.99,         289.94,  +5.57,  +5.03
  1,     UK001Z,       0,  0.120872, 2459443.435723546892,  48.51948,  78.16790,               16.14088,  45.80916,        16.13804,       45.80880,     48.51948,     +78.16790,      48.52646,      +78.16940,  1999279.50, -3492549.34,  5048731.88,      51.626723,       -2.601166,   91284.38,  126359.82,    3113.01,             3045.34,    22.50,  25754.64,           25948.22,     -1.27,     -4.24,           7.22,  +2.92,  +2.41
  2,     UK001Z,       0,  0.161152, 2459443.435724013019,  49.69162,  77.94014,               16.23492,  45.48296,        16.21587,       45.48055,     49.69162,     +77.94014,      49.73631,      +77.95013,  1999089.82, -3491933.31,  5047964.21,      51.626869,       -2.599320,   90292.11,  125677.13,    4115.40,             4047.73,    -1.75,  24885.44,           25948.22,     -8.55,    -28.52,          48.86,  +2.61,  +2.11
  3,     UK001Z,       0,  0.201472, 2459443.435724480078,  50.92314,  77.65506,               16.37278,  45.10931,        16.30576,       45.10082,     50.92314,     +77.65506,      51.08012,      +77.68967,  1998873.06, -3491229.31,  5047086.93,      51.627036,       -2.597187,   89158.14,  124902.52,    5260.93,             5193.25,   116.12,  28410.86,           25948.22,    -30.11,   -100.34,         173.00,  +2.53,  +2.05
  4,     UK001Z,       0,  0.241724, 2459443.435724945739,  52.04678,  77.49032,               16.37288,  44.81673,        16.37048,       44.81642,     52.04678,     +77.49032,      52.05341,      +77.49154,  1998712.31, -3490707.25,  5046436.36,      51.627160,       -2.595647,   88317.19,  124331.15,    6110.42,             6042.75,   -60.32,  21104.31,           25533.10,     -1.07,     -3.58,           6.20,  +2.37,  +1.90
  5,     UK001Z,       0,  0.281988, 2459443.435725411866,  53.04170,  77.27287,               16.44573,  44.51368,        16.43926,       44.51286,     53.04170,     +77.27287,      53.05815,      +77.27613,  1998542.40, -3490155.42,  5045748.70,      51.627290,       -2.594009,   87428.29,  123730.78,    7008.33,             6940.66,  -188.64,  22300.60,           25058.22,     -2.91,     -9.70,          16.87,  +1.82,  +1.36
  6,     UK001Z,       0,  0.322252, 2459443.435725877993,  54.02380,  77.04722,               16.51917,  44.20418,        16.50882,       44.20287,     54.02380,     +77.04722,      54.04966,      +77.05237,  1998370.60, -3489597.46,  5045053.40,      51.627423,       -2.592351,   86529.50,  123127.41,    7916.22,             7848.55,  -306.97,  22548.59,           24644.40,     -4.65,    -15.50,          27.11,  +1.63,  +1.18
  7,     UK001Z,       0,  0.362576, 2459443.435726344585,  55.16754,  76.76216,               16.61499,  43.82517,        16.59465,       43.82260,     55.16754,     +76.76216,      55.21738,      +76.77213,  1998162.28, -3488920.88,  5044210.28,      51.627583,       -2.590305,   85439.65,  122401.31,    9017.14,             8949.47,  -233.82,  27301.66,           24602.18,     -9.13,    -30.47,          53.61,  +1.57,  +1.13
  8,     UK001Z,       0,  0.402848, 2459443.435726810712,  56.12399,  76.53901,               16.66641,  43.51344,        16.66237,       43.51293,     56.12399,     +76.53901,      56.13529,      +76.54096,  1997994.35, -3488375.47,  5043530.61,      51.627712,       -2.588687,   84561.03,  121819.54,    9904.63,             9836.95,  -372.77,  22037.36,           24443.39,     -1.81,     -6.05,          10.70,  +2.31,  +1.88

Notes
-----
- Points that have not been taken into consideration when computing the trajectory have '1' in the 'Ignore' column.
- The time already has time offsets applied to it.
- 'meas1' and 'meas2' are given input points.
- X, Y, Z are ECI (Earth-Centered Inertial) positions of projected lines of sight on the radiant line.
- Zc is the observed zenith distance of the entry angle, while the Zg is the entry zenith distance corrected for Earth's gravity.
- Latitude (deg) and Longitude (deg) are in WGS84 coordinates, while Height (m) is in the EGM96 datum. There values are coordinates of each point on the radiant line.
- Jacchia (1955) deceleration equation fit was done on the lag.
- Right ascension and declination in the table are given in the epoch of date for the corresponding JD, per every point.
- 'RA and Dec obs' are the right ascension and declination calculated from the observed values, while the 'RA and Dec line' are coordinates of the lines of sight projected on the fitted radiant line. The coordinates are in the epoch of date, and NOT J2000!. 'Azim and alt line' are thus corresponding azimuthal coordinates.
- 'Vel prev avg' is the average velocity including all previous points up to the given point. For the first 4 points this velocity is computed as the average velocity of those 4 points.