PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/27-14:57:20
G10     294.1          51.0                6.8 +/-    2.57       8.5 +/-    2.57  0.030 / 0.030
G15     46.7           31.2                4.4 +/-    1.10       7.5 +/-    1.10  0.040 / 0.040
G20     346.4          65.4                6.6 +/-    0.46       7.1 +/-    0.46  0.100 / 0.060
G21     95.5           72.2                8.0 +/-    0.78       8.3 +/-    0.78  0.080 / 0.070
G24     96.1           25.1               10.1 +/-    1.37      19.7 +/-    1.37  0.090 / 0.140
G27     305.5          31.1                6.6 +/-    2.10      11.3 +/-    2.10  0.080 / 0.120
G32     209.7          28.1                7.0 +/-    0.89      12.8 +/-    0.89  0.050 / 0.120