PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-14:28:10
G01     94.9           30.6                9.8 +/-    0.76      17.0 +/-    0.76  0.030 / 0.030
G07     121.5          49.1                9.8 +/-    0.36      12.5 +/-    0.36  0.030 / 0.030
G08     42.0           10.3                9.2 +/-    2.16      25.6 +/-    2.16  0.070 / 0.150
G11     72.9           40.9                9.1 +/-    0.92      13.0 +/-    0.92  0.080 / 0.090
G13     299.0          34.7                9.8 +/-    1.23      15.7 +/-    1.23  0.030 / 0.050
G17     211.6          49.5               11.6 +/-    1.16      14.7 +/-    1.16  0.030 / 0.060
G18     67.7           24.3                8.5 +/-    0.73      16.8 +/-    0.73  0.040 / 0.060
G19     213.1          20.6                9.3 +/-    1.97      20.2 +/-    1.97  0.040 / 0.070
G28     340.6          61.9                8.4 +/-    0.70       9.4 +/-    0.70  0.050 / 0.100
G30     83.2           79.3               10.0 +/-    0.58      10.1 +/-    0.58  0.040 / 0.090