PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-15:42:40
G01     69.1           32.4                9.3 +/-    0.85      15.5 +/-    0.85  0.050 / 0.100
G07     137.8          26.5                9.1 +/-    0.70      17.3 +/-    0.70  0.040 / 0.110
G11     51.8           27.0                7.3 +/-    2.29      13.6 +/-    2.29  0.080 / 0.140
G13     275.2          36.7                9.6 +/-    1.56      14.8 +/-    1.56  0.070 / 0.150
G15     304.8          14.0                6.6 +/-    2.02      16.8 +/-    2.02  0.050 / 0.090
G17     237.7          72.8                9.2 +/-    0.95       9.5 +/-    0.95  0.040 / 0.080
G19     225.3          45.2               12.3 +/-    2.14      16.6 +/-    2.14  0.030 / 0.040
G28     21.7           58.9                9.8 +/-    0.25      11.3 +/-    0.25  0.040 / 0.050
G30     135.7          63.2               10.0 +/-    0.87      11.1 +/-    0.87  0.030 / 0.040