PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-19:27:40
G01     126.5          12.2               16.7 +/-    4.41      44.5 +/-    4.41  0.090 / 0.480
G07     53.7           69.7               13.5 +/-    0.44      14.3 +/-    0.44  0.110 / 0.470
G08     51.9           42.4               11.4 +/-    0.44      16.0 +/-    0.44  0.150 / 0.530
G09     178.6          35.8               15.2 +/-    1.87      23.8 +/-    1.87  0.140 / 0.390
G11     119.4          35.4               16.5 +/-    0.60      26.0 +/-    0.60  0.030 / 0.040
G13     321.1          11.9                9.2 +/-   10.50      24.7 +/-   10.50  0.030 / 0.040
G17     201.6          11.7               18.0 +/-   29.95      48.5 +/-   29.95  0.070 / 0.090
G18     103.6          17.0               13.6 +/-    1.43      32.1 +/-    1.43  0.070 / 0.110
G28     278.1          53.6               15.3 +/-    1.01      18.5 +/-    1.01  0.040 / 0.070
G30     336.7          62.6               12.5 +/-    0.60      13.8 +/-    0.60  0.040 / 0.060