PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/28-15:57:40
G02     58.1           33.6                9.6 +/-    0.91      15.7 +/-    0.91  0.030 / 0.040
G05     65.0           65.4               11.4 +/-    0.51      12.5 +/-    0.51  0.040 / 0.040
G12     186.6          36.1               14.1 +/-    1.68      21.9 +/-    1.68  0.110 / 0.270
G13     131.6          13.4               13.2 +/-    1.94      34.2 +/-    1.94  0.090 / 0.230
G15     164.5          10.4               -2.8 +/-   33.02      -7.6 +/-   33.02  0.050 / 0.060
G20     206.9          56.4               13.1 +/-    0.82      15.4 +/-    0.82  0.050 / 0.050
G21     270.1          18.3               10.3 +/-    1.40      23.5 +/-    1.40  0.060 / 0.090
G25     238.0          53.3               12.6 +/-    1.51      15.2 +/-    1.51  0.070 / 0.100
G29     332.0          57.9               10.6 +/-    0.91      12.2 +/-    0.91  0.030 / 0.060