PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-17:57:50
G08     293.4          22.7                5.6 +/-    0.91      11.6 +/-    0.91  0.080 / 0.110
G10     6.2            63.1                6.2 +/-    0.77       6.9 +/-    0.77  0.080 / 0.130
G14     230.3          46.6               11.0 +/-    1.02      14.5 +/-    1.02  0.040 / 0.090
G18     65.5           49.7                8.1 +/-    0.74      10.3 +/-    0.74  0.050 / 0.100
G21     145.4          34.8                9.8 +/-    0.79      15.7 +/-    0.79  0.070 / 0.130
G24     56.9           26.4                8.6 +/-    0.84      16.2 +/-    0.84  0.070 / 0.120
G27     252.8          31.4                7.7 +/-    1.30      13.2 +/-    1.30  0.030 / 0.030
G32     246.0          67.0                7.2 +/-    0.54       7.7 +/-    0.54  0.030 / 0.030