PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/06-21:57:50
G01     84.3           32.9               12.6 +/-    1.14      20.8 +/-    1.14  0.030 / 0.030
G07     129.8          41.6               14.5 +/-    1.19      20.5 +/-    1.19  0.040 / 0.040
G11     65.1           38.9               12.1 +/-    1.03      18.0 +/-    1.03  0.160 / 0.130
G13     289.1          36.9               13.7 +/-    1.82      21.0 +/-    1.82  0.100 / 0.150
G15     311.5          12.3               11.6 +/-    2.51      30.8 +/-    2.51  0.080 / 0.160
G17     219.2          54.2               15.7 +/-    1.25      18.9 +/-    1.25  0.110 / 0.220
G18     59.4           22.9               11.0 +/-    1.23      22.5 +/-    1.23  0.050 / 0.080
G19     217.2          31.1               16.3 +/-    2.57      27.8 +/-    2.57  0.060 / 0.090
G28     359.9          61.2               12.7 +/-    0.81      14.2 +/-    0.81  0.030 / 0.040
G30     119.6          69.7               16.0 +/-    0.39      17.0 +/-    0.39  0.040 / 0.040