PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/21-06:27:50
G02     65.5           26.9                1.4 +/-    1.14       2.6 +/-    1.14  0.060 / 0.120
G05     50.8           54.1                5.2 +/-    0.54       6.2 +/-    0.54  0.070 / 0.130
G12     184.5          27.1                5.5 +/-    1.02      10.3 +/-    1.02  0.060 / 0.070
G13     123.9          19.2                7.5 +/-    1.96      16.8 +/-    1.96  0.040 / 0.050
G15     159.5          17.5                5.8 +/-    1.72      13.5 +/-    1.72  0.340 / 0.240
G20     217.0          52.5                7.5 +/-    1.09       9.2 +/-    1.09  0.190 / 0.240
G21     276.5          21.8                6.2 +/-    3.27      13.1 +/-    3.27  0.030 / 0.030
G25     230.2          47.5                6.6 +/-    2.82       8.7 +/-    2.82  0.040 / 0.030
G29     332.8          60.9                3.1 +/-    0.31       3.5 +/-    0.31  0.080 / 0.250