PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-19:27:50
G02     50.6           41.0                9.4 +/-    0.82      13.4 +/-    0.82  0.020 / 0.040
G05     77.3           68.0               10.4 +/-    0.42      11.1 +/-    0.42  0.030 / 0.040
G12     182.7          38.7               12.9 +/-    2.11      19.2 +/-    2.11  0.130 / 0.530
G21     263.9          10.7                8.3 +/-   16.16      22.7 +/-   16.16  0.160 / 0.520
G25     250.6          57.1               11.5 +/-    0.72      13.4 +/-    0.72  0.060 / 0.080
G29     321.6          44.9                9.3 +/-    1.49      12.6 +/-    1.49  0.060 / 0.090