PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-18:57:40
G02     9.6            70.7               13.7 +/-    0.72      14.4 +/-    0.72  0.130 / 0.310
G05     163.0          43.3               18.4 +/-    1.37      25.3 +/-    1.37  0.130 / 0.350
G06     46.2           29.0                9.9 +/-    0.54      17.7 +/-    0.54  0.020 / 0.030
G12     256.8          79.9               13.7 +/-    0.73      13.9 +/-    0.73  0.030 / 0.030
G19     87.8           17.9               12.1 +/-    1.27      28.1 +/-    1.27  0.050 / 0.080
G20     197.2          11.7               22.8 +/-   29.24      61.3 +/-   29.24  0.060 / 0.080
G24     220.5          14.4               18.8 +/-    4.82      47.5 +/-    4.82  0.030 / 0.070
G25     311.3          44.9               13.5 +/-    2.15      18.2 +/-    2.15  0.030 / 0.060
G29     296.8          18.8               12.2 +/-    1.18      27.7 +/-    1.18  0.070 / 0.150