PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-17:12:50
G03     187.6          15.7               13.3 +/-    1.79      32.5 +/-    1.79  0.080 / 0.040
G07     294.1          39.3               13.0 +/-    2.18      19.1 +/-    2.18  0.090 / 0.050
G08     142.6          30.0               13.5 +/-    1.04      23.6 +/-    1.04  0.020 / 0.030
G09     319.1          66.4               12.3 +/-    0.36      13.3 +/-    0.36  0.030 / 0.040
G16     41.9           33.8                9.1 +/-    1.60      14.8 +/-    1.60  0.080 / 0.100
G23     129.0          70.9               12.0 +/-    0.69      12.6 +/-    0.69  0.060 / 0.120
G27     93.8           35.3               12.0 +/-    0.86      18.9 +/-    0.86  0.120 / 0.120
G30     277.5          16.5               12.4 +/-    0.85      29.6 +/-    0.85  0.160 / 0.180