PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/22-21:57:50
G02     199.8          19.7               15.3 +/-    1.45      33.9 +/-    1.45  0.070 / 0.130
G06     174.0          49.8               13.0 +/-    0.80      16.5 +/-    0.80  0.080 / 0.110
G13     227.4          14.4               13.7 +/-    2.51      34.7 +/-    2.51  0.050 / 0.060
G17     21.1           60.5               11.1 +/-    1.10      12.5 +/-    1.10  0.060 / 0.080
G19     317.9          71.5                9.7 +/-    0.70      10.1 +/-    0.70  0.190 / 0.340
G24     310.2          29.4                8.9 +/-    1.04      15.8 +/-    1.04  0.220 / 0.350
G28     82.7           44.1               10.0 +/-    1.50      13.6 +/-    1.50  0.180 / 0.290
G30     156.4          14.6               15.0 +/-    2.42      37.7 +/-    2.42  0.100 / 0.310