PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/15-18:58:00
G01     95.5           30.5               14.2 +/-    0.63      24.6 +/-    0.63  0.080 / 0.160
G07     120.9          49.9               15.5 +/-    0.38      19.5 +/-    0.38  0.070 / 0.160
G08     42.1           13.4                9.4 +/-    0.98      24.2 +/-    0.98  0.030 / 0.040
G11     75.3           41.9               14.5 +/-    0.81      20.4 +/-    0.81  0.030 / 0.040
G13     299.7          34.2               13.5 +/-    1.39      21.8 +/-    1.39  0.040 / 0.090
G17     212.2          45.7               16.3 +/-    1.45      21.7 +/-    1.45  0.050 / 0.100
G18     68.9           24.7               12.8 +/-    0.83      25.1 +/-    0.83  0.050 / 0.070
G19     212.9          21.6               15.3 +/-    2.02      32.4 +/-    2.02  0.040 / 0.050
G28     340.5          61.9               13.3 +/-    0.68      14.9 +/-    0.68  0.030 / 0.050
G30     87.8           78.0               15.8 +/-    0.43      16.1 +/-    0.43  0.030 / 0.060