PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/13-14:27:50
G01     109.4          24.3                9.0 +/-    0.81      17.9 +/-    0.81  0.030 / 0.030
G07     103.0          60.1               11.7 +/-    0.66      13.3 +/-    0.66  0.030 / 0.030
G08     42.1           22.0                8.3 +/-    1.38      17.4 +/-    1.38  0.070 / 0.140
G09     174.4          14.5               12.2 +/-    1.86      30.7 +/-    1.86  0.070 / 0.140
G11     91.6           42.5               11.1 +/-    0.59      15.5 +/-    0.59  0.040 / 0.100
G13     311.3          27.3                8.6 +/-    1.38      15.9 +/-    1.38  0.060 / 0.070
G17     205.0          35.2               12.8 +/-    0.65      20.2 +/-    0.65  0.040 / 0.040
G18     82.6           23.8                8.2 +/-    0.62      16.5 +/-    0.62  0.030 / 0.040
G28     313.0          60.5               10.1 +/-    0.81      11.4 +/-    0.81  0.040 / 0.050
G30     10.7           76.5               11.8 +/-    0.52      12.1 +/-    0.52  0.050 / 0.060