PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-01:28:10
G02     47.3           42.9                9.0 +/-    0.54      12.5 +/-    0.54  0.040 / 0.050
G05     92.9           68.8                9.4 +/-    0.64      10.0 +/-    0.64  0.040 / 0.060
G12     188.0          49.5               11.3 +/-    0.97      14.4 +/-    0.97  0.030 / 0.040
G25     267.9          58.1               10.9 +/-    0.41      12.6 +/-    0.41  0.030 / 0.040
G29     317.6          39.6                9.4 +/-    1.63      13.8 +/-    1.63  0.040 / 0.060