PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/19-13:12:40
G01     128.8          10.2              -20.5 +/-   13.92     -56.8 +/-   13.92  0.030 / 0.030
G07     45.6           69.7                7.7 +/-    0.67       8.2 +/-    0.67  0.060 / 0.040
G08     51.9           40.8                6.1 +/-    0.51       8.8 +/-    0.51  0.150 / 0.410
G09     177.1          36.9                9.0 +/-    1.00      13.9 +/-    1.00  0.030 / 0.030
G11     120.0          34.1                8.4 +/-    0.48      13.6 +/-    0.48  0.030 / 0.040
G17     199.7          12.7                6.7 +/-    2.83      17.6 +/-    2.83  0.060 / 0.120
G18     105.6          15.5                7.7 +/-    1.28      19.0 +/-    1.28  0.060 / 0.100
G28     272.6          51.6                7.4 +/-    1.07       9.1 +/-    1.07  0.050 / 0.090
G30     329.3          58.0                6.1 +/-    0.92       7.1 +/-    0.92  0.050 / 0.080