PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-18:57:50
G01     113.4          21.2               13.1 +/-    1.67      28.0 +/-    1.67  0.040 / 0.040
G07     100.2          57.4               13.3 +/-    0.82      15.5 +/-    0.82  0.040 / 0.040
G08     42.9           25.8               10.1 +/-    2.51      19.3 +/-    2.51  0.030 / 0.020
G09     176.8          21.6               12.6 +/-    1.60      26.6 +/-    1.60  0.030 / 0.030
G11     97.2           42.2               13.8 +/-    0.54      19.4 +/-    0.54  0.050 / 0.050
G13     314.2          24.6               11.0 +/-    1.47      21.6 +/-    1.47  0.040 / 0.050
G17     202.4          30.9               14.2 +/-    1.61      24.4 +/-    1.61  0.070 / 0.220
G18     85.8           22.4               12.5 +/-    1.95      26.0 +/-    1.95  0.070 / 0.170
G28     296.0          56.9               12.5 +/-    0.83      14.6 +/-    0.83  0.130 / 0.180
G30     4.1            74.4               12.9 +/-    0.90      13.4 +/-    0.90  0.110 / 0.250