PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-16:12:40
G01     48.3           23.8                9.1 +/-    1.92      18.4 +/-    1.92  0.070 / 0.230
G06     177.1          27.6               14.2 +/-    2.15      26.2 +/-    2.15  0.070 / 0.230
G11     43.5           10.5                9.4 +/-    2.15      25.9 +/-    2.15  0.040 / 0.050
G13     250.3          29.1               11.4 +/-    1.60      20.4 +/-    1.60  0.050 / 0.060
G15     284.9          14.9                8.2 +/-    1.90      20.5 +/-    1.90  0.060 / 0.180
G17     338.6          77.3               11.6 +/-    0.41      11.9 +/-    0.41  0.080 / 0.120
G19     252.7          64.0               13.1 +/-    0.85      14.4 +/-    0.85  0.020 / 0.020
G28     56.0           51.9               11.4 +/-    0.92      14.1 +/-    0.92  0.020 / 0.030
G30     150.9          41.4               12.1 +/-    0.64      17.2 +/-    0.64  0.080 / 0.180