PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/19-20:27:50
G10     254.7          30.2                9.6 +/-    2.34      16.8 +/-    2.34  0.040 / 0.040
G13     49.5           26.9                7.3 +/-    2.52      13.6 +/-    2.52  0.040 / 0.040
G15     85.6           59.6                8.8 +/-    0.73      10.0 +/-    0.73  0.120 / 0.500
G16     290.5          15.2                7.2 +/-    2.02      17.8 +/-    2.02  0.110 / 0.470
G20     276.3          53.7                8.6 +/-    2.98      10.4 +/-    2.98  0.110 / 0.150
G21     340.2          63.4                8.9 +/-    0.62       9.8 +/-    0.62  0.110 / 0.160
G26     263.4          13.6                7.7 +/-    1.62      19.9 +/-    1.62  0.030 / 0.030
G29     165.9          45.3                9.4 +/-    0.67      12.6 +/-    0.67  0.040 / 0.030