PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-17:43:10
G01     119.6          17.6               12.5 +/-    2.00      29.1 +/-    2.00  0.100 / 0.070
G07     78.4           67.1               10.3 +/-    0.66      11.1 +/-    0.66  0.040 / 0.070
G08     45.9           34.0                9.4 +/-    1.14      15.1 +/-    1.14  0.030 / 0.030
G09     177.1          26.6               10.9 +/-    1.40      20.5 +/-    1.40  0.030 / 0.030
G11     108.6          39.7               10.9 +/-    0.61      15.9 +/-    0.61  0.100 / 0.170
G13     318.0          18.9               10.5 +/-    2.86      23.8 +/-    2.86  0.100 / 0.200
G17     202.5          21.3               13.6 +/-    1.43      29.1 +/-    1.43  0.020 / 0.030
G18     95.2           20.7                9.8 +/-    1.45      21.3 +/-    1.45  0.030 / 0.030
G28     292.1          57.3               10.5 +/-    1.44      12.2 +/-    1.44  0.040 / 0.050
G30     347.4          68.7                9.2 +/-    0.33       9.8 +/-    0.33  0.040 / 0.060