PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-15:27:50
G01     66.7           32.3                9.7 +/-    0.61      16.2 +/-    0.61  0.030 / 0.040
G07     139.4          27.9                9.9 +/-    1.65      18.1 +/-    1.65  0.040 / 0.040
G11     51.1           27.8                7.3 +/-    1.23      13.4 +/-    1.23  0.060 / 0.080
G13     269.8          37.1               10.6 +/-    1.18      16.2 +/-    1.18  0.060 / 0.090
G15     301.7          14.6                8.6 +/-    1.82      21.5 +/-    1.82  0.050 / 0.130
G17     240.7          72.0               11.4 +/-    0.53      11.9 +/-    0.53  0.050 / 0.130
G18     46.2           16.2                8.0 +/-    0.85      19.4 +/-    0.85  0.040 / 0.050
G19     226.7          42.3               13.4 +/-    0.55      18.8 +/-    0.55  0.030 / 0.060
G28     25.5           58.5               10.8 +/-    0.62      12.5 +/-    0.62  0.060 / 0.200
G30     139.1          59.3               10.5 +/-    0.70      12.0 +/-    0.70  0.070 / 0.150