PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-19:12:50
G01     120.0          17.3               16.0 +/-    0.61      37.6 +/-    0.61  0.050 / 0.080
G07     77.0           67.4               12.8 +/-    0.51      13.7 +/-    0.51  0.040 / 0.080
G08     46.5           35.5               11.9 +/-    0.46      18.8 +/-    0.46  0.040 / 0.070
G09     177.5          27.4               16.1 +/-    1.88      29.7 +/-    1.88  0.040 / 0.060
G11     109.9          39.5               17.0 +/-    0.90      25.0 +/-    0.90  0.090 / 0.270
G13     318.3          18.4               12.0 +/-    1.55      27.4 +/-    1.55  0.090 / 0.300
G17     202.7          19.8               15.8 +/-    0.95      34.9 +/-    0.95  0.020 / 0.040
G18     95.8           20.5               14.4 +/-    0.49      31.4 +/-    0.49  0.030 / 0.040
G28     291.5          57.2               14.7 +/-    1.13      17.1 +/-    1.13  0.040 / 0.110
G30     348.3          68.8               11.6 +/-    0.44      12.4 +/-    0.44  0.040 / 0.080