PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-14:27:50
G01     115.6          20.1                9.3 +/-    1.31      20.4 +/-    1.31  0.190 / 0.220
G07     93.2           61.2               10.0 +/-    0.86      11.2 +/-    0.86  0.150 / 0.210
G08     43.4           26.5                7.7 +/-    2.75      14.4 +/-    2.75  0.030 / 0.030
G09     175.3          21.2               10.5 +/-    2.50      22.4 +/-    2.50  0.030 / 0.040
G11     98.6           39.4                9.7 +/-    0.54      14.3 +/-    0.54  0.110 / 0.360
G13     316.9          20.5                7.3 +/-    2.39      16.0 +/-    2.39  0.130 / 0.320
G17     201.9          30.6                9.6 +/-    1.22      16.6 +/-    1.22  0.040 / 0.020
G28     299.7          58.5                8.5 +/-    0.87       9.8 +/-    0.87  0.030 / 0.020
G30     348.2          69.5                9.3 +/-    0.76       9.9 +/-    0.76  0.090 / 0.100