PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/12-13:57:50
G02     81.0           14.5                5.8 +/-    1.14      14.6 +/-    1.14  0.030 / 0.070
G05     44.6           37.1                4.2 +/-    0.62       6.4 +/-    0.62  0.040 / 0.070
G13     105.6          31.4                8.8 +/-    0.80      14.9 +/-    0.80  0.040 / 0.100
G15     146.7          34.6                9.1 +/-    1.32      14.6 +/-    1.32  0.060 / 0.110
G18     228.7          25.3                7.5 +/-    2.59      14.5 +/-    2.59  0.120 / 0.350
G20     267.2          83.8                6.2 +/-    0.68       6.3 +/-    0.68  0.110 / 0.390
G21     295.9          37.5                4.7 +/-    0.92       7.2 +/-    0.92  0.040 / 0.040
G25     211.6          29.6                3.7 +/-    2.00       6.5 +/-    2.00  0.040 / 0.050
G26     311.5          15.4               -9.6 +/-   28.53     -23.6 +/-   28.53  0.070 / 0.140
G29     24.6           84.3                4.5 +/-    0.45       4.6 +/-    0.45  0.080 / 0.150