PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-18:28:20
G01     126.0          11.8                9.6 +/-   22.21      25.8 +/-   22.21  0.060 / 0.070
G07     69.6           65.8               13.0 +/-    0.68      14.1 +/-    0.68  0.050 / 0.070
G08     49.6           38.3               11.2 +/-    0.92      16.7 +/-    0.92  0.030 / 0.050
G09     178.8          36.7               14.6 +/-    1.33      22.4 +/-    1.33  0.030 / 0.050
G11     116.1          36.4               13.6 +/-    1.05      21.1 +/-    1.05  0.040 / 0.040
G13     320.6          13.0               10.0 +/-    2.31      26.2 +/-    2.31  0.030 / 0.040
G17     199.3          16.0               16.2 +/-    3.54      39.2 +/-    3.54  0.140 / 0.390
G18     100.8          16.9               11.8 +/-    1.18      28.0 +/-    1.18  0.130 / 0.390
G28     272.2          49.8               12.5 +/-    1.32      15.8 +/-    1.32  0.090 / 0.410
G30     335.9          62.5               12.1 +/-    0.64      13.4 +/-    0.64  0.110 / 0.330