PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/30-16:57:40
G02     56.9           36.1                8.0 +/-    0.91      12.5 +/-    0.91  0.200 / 0.440
G05     63.3           65.5                8.9 +/-    0.39       9.7 +/-    0.39  0.240 / 0.460
G12     183.0          31.9                8.9 +/-    1.84      14.9 +/-    1.84  0.070 / 0.080
G13     128.6          14.5               11.9 +/-    2.27      30.0 +/-    2.27  0.070 / 0.070
G21     270.7          16.9                8.6 +/-    2.12      20.4 +/-    2.12  0.050 / 0.100
G25     233.6          52.2               10.9 +/-    2.91      13.4 +/-    2.91  0.070 / 0.090
G29     327.4          53.1                7.7 +/-    0.93       9.4 +/-    0.93  0.030 / 0.020