PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-23:58:00
G02     229.2          71.5               11.1 +/-    0.26      11.7 +/-    0.26  0.050 / 0.090
G05     173.2          11.7               15.3 +/-   18.65      41.1 +/-   18.65  0.070 / 0.100
G06     43.2           67.7                8.2 +/-    0.45       8.8 +/-    0.45  0.040 / 0.060
G12     320.1          43.2                9.7 +/-    0.73      13.5 +/-    0.73  0.040 / 0.050
G17     66.1           25.1               10.9 +/-    0.98      21.2 +/-    0.98  0.150 / 0.340
G19     50.8           42.1                9.6 +/-    1.55      13.6 +/-    1.55  0.170 / 0.320
G24     250.3          37.7               12.1 +/-    1.80      18.2 +/-    1.80  0.040 / 0.060