PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/31-13:58:00
G01     87.3           32.4                5.8 +/-    1.13       9.6 +/-    1.13  0.030 / 0.030
G07     127.7          43.3                7.5 +/-    0.98      10.4 +/-    0.98  0.030 / 0.040
G11     65.1           38.2                4.5 +/-    0.70       6.8 +/-    0.70  0.070 / 0.120
G13     291.5          36.9                7.2 +/-    1.62      11.0 +/-    1.62  0.070 / 0.120
G17     216.2          56.6                7.1 +/-    1.04       8.3 +/-    1.04  0.040 / 0.090
G18     60.9           23.1                4.5 +/-    0.49       9.2 +/-    0.49  0.050 / 0.110
G19     215.9          26.3                6.7 +/-    1.59      12.8 +/-    1.59  0.060 / 0.060
G28     353.5          61.6                5.5 +/-    1.26       6.2 +/-    1.26  0.060 / 0.050
G30     109.9          75.5                6.6 +/-    0.59       6.8 +/-    0.59  0.050 / 0.070