PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-18:57:20
G02     40.6           49.3                9.5 +/-    0.58      12.0 +/-    0.58  0.040 / 0.040
G05     113.8          69.0                9.4 +/-    0.50      10.0 +/-    0.50  0.040 / 0.040
G12     184.8          51.6               10.4 +/-    1.94      12.8 +/-    1.94  0.040 / 0.070
G25     275.2          58.7               10.5 +/-    1.31      12.1 +/-    1.31  0.040 / 0.080
G29     314.1          35.2                7.4 +/-    1.82      11.7 +/-    1.82  0.040 / 0.070