PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/13-13:57:40
G01     121.5          16.1               10.9 +/-    1.84      26.5 +/-    1.84  0.040 / 0.030
G07     72.9           67.8                9.2 +/-    1.16       9.8 +/-    1.16  0.040 / 0.030
G08     46.1           33.6                8.5 +/-    0.76      13.9 +/-    0.76  0.110 / 0.190
G09     176.3          27.5               12.8 +/-    2.98      23.7 +/-    2.98  0.110 / 0.210
G11     109.8          38.8               10.5 +/-    0.78      15.6 +/-    0.78  0.040 / 0.090
G13     318.9          17.3                5.1 +/-    1.47      12.0 +/-    1.47  0.040 / 0.090
G17     201.1          21.4               10.9 +/-    1.03      23.1 +/-    1.03  0.020 / 0.030
G18     96.9           19.7                9.7 +/-    1.44      21.5 +/-    1.44  0.030 / 0.040
G28     287.5          56.2                8.5 +/-    0.72      10.0 +/-    0.72  0.050 / 0.060
G30     340.8          65.7                8.8 +/-    0.71       9.6 +/-    0.71  0.050 / 0.060