PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/25-15:13:10
G01     89.8           31.6                9.8 +/-    0.88      16.7 +/-    0.88  0.060 / 0.110
G07     125.9          41.8               11.3 +/-    1.03      16.0 +/-    1.03  0.050 / 0.140
G11     66.7           37.0                8.7 +/-    0.44      13.3 +/-    0.44  0.030 / 0.030
G13     296.5          34.8               10.5 +/-    1.52      16.8 +/-    1.52  0.020 / 0.030
G17     214.1          56.2               13.4 +/-    1.08      15.7 +/-    1.08  0.030 / 0.070
G19     214.4          28.9               12.0 +/-    1.21      21.5 +/-    1.21  0.040 / 0.080
G28     349.2          61.5                9.7 +/-    0.54      10.9 +/-    0.54  0.030 / 0.060
G30     95.7           78.1               10.2 +/-    0.56      10.4 +/-    0.56  0.040 / 0.050