PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-13:42:50
G01     111.1          23.2                9.2 +/-    1.29      18.7 +/-    1.29  0.040 / 0.030
G07     99.8           61.3                7.4 +/-    0.68       8.4 +/-    0.68  0.040 / 0.030
G08     42.3           23.1                6.0 +/-    1.22      12.2 +/-    1.22  0.100 / 0.180
G09     174.5          16.0                9.3 +/-    2.00      22.5 +/-    2.00  0.090 / 0.190
G11     93.9           42.3               10.0 +/-    0.46      14.0 +/-    0.46  0.070 / 0.110
G13     312.6          26.1                6.8 +/-    1.36      13.1 +/-    1.36  0.070 / 0.090
G17     204.1          33.8                8.3 +/-    1.11      13.5 +/-    1.11  0.040 / 0.060
G18     84.5           23.4                7.2 +/-    0.70      14.7 +/-    0.70  0.030 / 0.050
G28     309.2          60.1                7.6 +/-    0.97       8.7 +/-    0.97  0.020 / 0.030
G30     3.7            75.0                8.0 +/-    0.30       8.2 +/-    0.30  0.030 / 0.030