PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-22:12:40
G02     199.7          19.1               14.0 +/-    1.80      31.5 +/-    1.80  0.070 / 0.140
G06     174.4          48.9               13.2 +/-    0.58      16.8 +/-    0.58  0.080 / 0.130
G13     227.9          14.8               12.6 +/-    1.66      31.6 +/-    1.66  0.280 / 0.410
G17     20.5           60.9               12.3 +/-    0.77      13.8 +/-    0.77  0.130 / 0.230
G19     315.5          71.5               11.1 +/-    0.82      11.7 +/-    0.82  0.040 / 0.030
G24     310.6          29.0               10.1 +/-    1.02      18.0 +/-    1.02  0.040 / 0.030
G28     82.0           44.4               11.3 +/-    0.97      15.4 +/-    0.97  0.050 / 0.080
G30     156.4          15.3               11.7 +/-    2.67      28.9 +/-    2.67  0.060 / 0.070