PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-20:43:00
G01     94.0           30.9               13.7 +/-    0.35      23.5 +/-    0.35  0.080 / 0.130
G07     122.2          48.9               13.7 +/-    0.47      17.5 +/-    0.47  0.080 / 0.120
G08     42.3           13.6                7.4 +/-    1.06      19.1 +/-    1.06  0.070 / 0.130
G11     74.5           41.9               13.1 +/-    0.96      18.4 +/-    0.96  0.060 / 0.130
G13     298.6          34.6               13.0 +/-    1.49      20.9 +/-    1.49  0.030 / 0.050
G17     213.2          45.5               14.7 +/-    0.99      19.6 +/-    0.99  0.030 / 0.050
G18     67.8           24.6               11.4 +/-    0.88      22.4 +/-    0.88  0.040 / 0.090
G19     213.3          23.3               17.7 +/-    1.82      35.9 +/-    1.82  0.040 / 0.090
G28     343.4          61.9               11.9 +/-    0.70      13.3 +/-    0.70  0.040 / 0.060
G30     95.7           76.5               13.4 +/-    1.20      13.8 +/-    1.20  0.040 / 0.060