PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/11/21-13:27:50
G02     59.2           33.2                2.9 +/-    0.68       4.7 +/-    0.68  0.040 / 0.060
G05     60.0           63.5                3.8 +/-    0.90       4.2 +/-    0.90  0.040 / 0.060
G12     184.4          32.4                4.6 +/-    0.55       7.7 +/-    0.55  0.100 / 0.090
G13     127.5          15.3                4.4 +/-    1.92      11.0 +/-    1.92  0.060 / 0.100
G15     165.3          11.5                3.4 +/-   11.28       9.1 +/-   11.28  0.020 / 0.020
G21     272.5          19.2                4.5 +/-    1.55      10.2 +/-    1.55  0.020 / 0.040
G25     228.0          50.6                5.0 +/-    0.58       6.3 +/-    0.58  0.090 / 0.180
G29     329.4          55.5                2.6 +/-    1.07       3.0 +/-    1.07  0.090 / 0.250