PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/13-09:28:00
G01     127.3          11.4               -2.6 +/-   27.97      -7.1 +/-   27.97  0.030 / 0.040
G07     53.8           69.3                5.5 +/-    0.45       5.9 +/-    0.45  0.040 / 0.030
G08     49.7           38.1                4.5 +/-    1.33       6.8 +/-    1.33  0.250 / 0.400
G09     174.7          32.1                5.5 +/-    1.35       9.3 +/-    1.35  0.220 / 0.340
G11     117.2          35.4                7.4 +/-    0.94      11.6 +/-    0.94  0.310 / 0.450
G13     321.1          11.7               -1.4 +/-   12.50      -3.9 +/-   12.50  0.150 / 0.310
G17     199.3          15.9                5.1 +/-    1.71      12.5 +/-    1.71  0.130 / 0.230
G18     102.7          16.5                5.7 +/-    1.40      13.7 +/-    1.40  0.150 / 0.250
G28     274.8          52.1                6.0 +/-    3.08       7.3 +/-    3.08  0.030 / 0.020
G30     330.6          59.1                4.5 +/-    0.30       5.2 +/-    0.30  0.030 / 0.030