PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-21:57:40
G01     57.9           29.8               13.5 +/-    2.15      23.8 +/-    2.15  0.030 / 0.030
G07     143.3          20.7               17.6 +/-    1.36      38.1 +/-    1.36  0.030 / 0.030
G11     48.0           23.4               10.1 +/-    1.83      20.5 +/-    1.83  0.100 / 0.080
G13     260.4          34.4               16.8 +/-    1.35      27.0 +/-    1.35  0.100 / 0.080
G15     291.7          16.5               13.6 +/-    1.04      32.6 +/-    1.04  0.330 / 0.370
G17     256.9          73.2               13.1 +/-    0.58      13.6 +/-    0.58  0.150 / 0.470
G18     41.4           11.9               10.7 +/-    2.73      28.7 +/-    2.73  0.050 / 0.040
G19     235.0          51.8               17.1 +/-    2.24      21.1 +/-    2.24  0.050 / 0.040
G28     40.0           55.8               11.9 +/-    0.53      14.1 +/-    0.53  0.130 / 0.170
G30     144.7          48.2               15.9 +/-    0.40      20.5 +/-    0.40  0.100 / 0.170