PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/15-10:27:50
G02     52.8           36.8                5.0 +/-    1.57       7.7 +/-    1.57  0.040 / 0.030
G05     82.2           69.2                5.9 +/-    0.96       6.2 +/-    0.96  0.020 / 0.030
G12     184.4          42.6                7.2 +/-    0.54      10.0 +/-    0.54  0.040 / 0.060
G21     264.0          11.7                0.0 +/-   11.77       0.1 +/-   11.77  0.040 / 0.060
G25     253.8          57.5                4.5 +/-    1.71       5.3 +/-    1.71  0.270 / 0.370
G29     321.2          44.2                4.7 +/-    0.59       6.4 +/-    0.59  0.300 / 0.430