PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-14:12:40
G01     108.1          24.7               11.7 +/-    1.20      23.0 +/-    1.20  0.180 / 0.220
G07     106.7          55.8               11.4 +/-    0.52      13.5 +/-    0.52  0.180 / 0.260
G08     41.9           19.7                8.1 +/-    1.77      17.9 +/-    1.77  0.030 / 0.040
G09     173.9          13.4                9.4 +/-    1.65      24.3 +/-    1.65  0.030 / 0.030
G11     87.9           40.6               11.5 +/-    1.08      16.5 +/-    1.08  0.030 / 0.020
G13     312.0          26.1                7.3 +/-    1.65      13.8 +/-    1.65  0.030 / 0.030
G17     204.6          39.0               12.7 +/-    0.79      18.8 +/-    0.79  0.120 / 0.220
G19     208.4          13.4                7.0 +/-    2.44      18.1 +/-    2.44  0.120 / 0.190
G28     315.4          60.5                9.3 +/-    0.59      10.5 +/-    0.59  0.080 / 0.080
G30     7.8            75.9               10.5 +/-    0.60      10.8 +/-    0.60  0.050 / 0.050