PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/17-06:42:40
G02     65.1           27.2                1.8 +/-    1.36       3.3 +/-    1.36  0.060 / 0.120
G05     51.3           54.7                4.5 +/-    0.54       5.3 +/-    0.54  0.070 / 0.130
G12     184.7          27.8                4.8 +/-    1.17       8.9 +/-    1.17  0.030 / 0.030
G13     124.5          18.8                7.5 +/-    1.82      17.1 +/-    1.82  0.020 / 0.030
G15     159.8          17.0                6.4 +/-    1.60      15.2 +/-    1.60  0.040 / 0.050
G20     216.0          54.2                7.4 +/-    0.76       8.9 +/-    0.76  0.040 / 0.060
G21     276.1          21.6                5.3 +/-    1.74      11.3 +/-    1.74  0.220 / 0.340
G25     230.9          48.0                6.0 +/-    2.64       7.8 +/-    2.64  0.230 / 0.300
G29     332.5          60.4                2.2 +/-    0.33       2.5 +/-    0.33  0.060 / 0.080