PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-14:58:00
G01     78.8           33.2                9.5 +/-    1.31      15.5 +/-    1.31  0.030 / 0.030
G07     133.2          37.1               11.1 +/-    0.77      17.0 +/-    0.77  0.030 / 0.030
G11     58.5           34.6                7.6 +/-    0.86      12.2 +/-    0.86  0.070 / 0.100
G13     282.8          37.9                9.6 +/-    1.14      14.4 +/-    1.14  0.060 / 0.110
G15     310.3          12.0                7.4 +/-    2.06      19.9 +/-    2.06  0.060 / 0.100
G17     223.4          63.0               13.2 +/-    0.48      14.7 +/-    0.48  0.050 / 0.070
G18     54.4           20.9                7.1 +/-    1.73      15.3 +/-    1.73  0.040 / 0.050
G19     219.7          32.9               11.1 +/-    2.78      18.4 +/-    2.78  0.030 / 0.060
G28     7.1            60.7                8.7 +/-    0.41       9.8 +/-    0.41  0.040 / 0.130
G30     126.4          69.2                9.8 +/-    0.49      10.4 +/-    0.49  0.050 / 0.120