PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-21:58:10
G02     40.1           50.2               11.5 +/-    0.81      14.5 +/-    0.81  0.070 / 0.060
G05     120.5          69.3               13.2 +/-    0.42      14.0 +/-    0.42  0.190 / 0.090
G12     189.0          53.5               12.5 +/-    0.98      15.1 +/-    0.98  0.060 / 0.050
G20     199.4          39.6               13.8 +/-    0.95      20.2 +/-    0.95  0.110 / 0.080
G25     267.4          60.4               12.6 +/-    1.01      14.2 +/-    1.01  0.050 / 0.050
G29     315.9          38.1               11.2 +/-    1.05      16.9 +/-    1.05  0.150 / 0.040