PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-20:12:30
G10     252.0          28.1               11.0 +/-    1.95      20.1 +/-    1.95  0.030 / 0.040
G13     52.0           28.7                8.2 +/-    2.11      14.7 +/-    2.11  0.030 / 0.040
G15     92.1           60.0                9.9 +/-    0.72      11.2 +/-    0.72  0.120 / 0.380
G16     293.5          15.6                7.7 +/-    1.58      18.9 +/-    1.58  0.100 / 0.370
G20     272.0          51.8               10.6 +/-    2.84      13.1 +/-    2.84  0.090 / 0.190
G21     336.1          61.3               10.1 +/-    0.58      11.4 +/-    0.58  0.080 / 0.140
G26     266.2          14.9                8.9 +/-    1.50      22.2 +/-    1.50  0.040 / 0.040
G29     165.2          48.7               11.5 +/-    0.54      14.7 +/-    0.54  0.030 / 0.030