PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-17:13:10
G07     38.2           69.8               10.1 +/-    1.28      10.7 +/-    1.28  0.030 / 0.040
G08     55.5           44.8                9.8 +/-    0.57      13.3 +/-    0.57  0.030 / 0.030
G09     178.7          40.7               11.8 +/-    1.85      17.0 +/-    1.85  0.060 / 0.070
G11     123.7          32.5               11.3 +/-    0.87      18.7 +/-    0.87  0.040 / 0.060
G18     108.0          14.5               12.0 +/-    1.88      30.3 +/-    1.88  0.030 / 0.050
G27     37.8           10.3                9.2 +/-    2.02      25.6 +/-    2.02  0.030 / 0.040
G28     270.2          50.7               11.4 +/-    0.84      14.2 +/-    0.84  0.050 / 0.070
G30     329.2          57.7                9.1 +/-    0.53      10.6 +/-    0.53  0.050 / 0.080