PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-19:58:20
G01     85.4           32.3               14.9 +/-    0.96      24.9 +/-    0.96  0.040 / 0.060
G07     129.1          36.1               16.0 +/-    1.30      24.9 +/-    1.30  0.040 / 0.060
G11     63.2           37.8               13.0 +/-    0.70      19.7 +/-    0.70  0.040 / 0.090
G13     289.6          37.8               13.8 +/-    0.79      20.9 +/-    0.79  0.030 / 0.070
G15     312.1          12.0               11.0 +/-    1.24      29.5 +/-    1.24  0.030 / 0.040
G17     216.3          57.9               16.2 +/-    0.77      18.8 +/-    0.77  0.030 / 0.030
G18     58.0           21.9               10.8 +/-    1.21      22.6 +/-    1.21  0.110 / 0.130
G19     215.7          30.7               17.0 +/-    1.79      29.4 +/-    1.79  0.100 / 0.120
G28     346.5          61.7               12.7 +/-    0.74      14.2 +/-    0.74  0.080 / 0.250
G30     116.8          71.7               16.1 +/-    0.80      16.8 +/-    0.80  0.090 / 0.230