PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/17-14:58:00
G01     53.7           27.4                7.4 +/-    2.50      13.6 +/-    2.50  0.140 / 0.420
G06     178.2          19.9               -5.1 +/-   34.31     -11.1 +/-   34.31  0.190 / 0.260
G07     143.8          13.8                9.4 +/-    2.49      24.2 +/-    2.49  0.040 / 0.050
G11     45.8           19.7                7.0 +/-    1.54      15.4 +/-    1.54  0.050 / 0.060
G13     254.7          33.7               11.4 +/-    1.02      18.6 +/-    1.02  0.230 / 0.390
G15     288.3          16.2                8.7 +/-    2.05      20.9 +/-    2.05  0.130 / 0.330
G17     272.2          77.0               11.1 +/-    0.55      11.4 +/-    0.55  0.040 / 0.030
G19     238.7          57.1               11.0 +/-    2.42      12.8 +/-    2.42  0.030 / 0.050
G28     35.0           58.1               10.2 +/-    1.52      11.7 +/-    1.52  0.060 / 0.100
G30     146.9          45.4               10.0 +/-    0.67      13.4 +/-    0.67  0.110 / 0.060