PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-04:13:00
G02     61.0           30.9                3.5 +/-    0.72       6.0 +/-    0.72  0.060 / 0.130
G05     56.1           58.9                4.7 +/-    0.34       5.4 +/-    0.34  0.070 / 0.100
G12     185.0          32.2                5.7 +/-    1.10       9.6 +/-    1.10  0.030 / 0.050
G13     128.1          15.6                5.9 +/-    2.24      14.5 +/-    2.24  0.030 / 0.050
G15     162.9          12.9                5.1 +/-    2.37      13.4 +/-    2.37  0.040 / 0.090
G20     216.8          30.1                7.1 +/-    2.91      12.3 +/-    2.91  0.040 / 0.080
G21     271.8          17.8                8.3 +/-    1.80      19.2 +/-    1.80  0.090 / 0.240
G25     237.4          51.6                6.1 +/-    0.98       7.5 +/-    0.98  0.080 / 0.210
G29     328.5          54.9                3.8 +/-    0.61       4.6 +/-    0.61  0.060 / 0.120