PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-14:27:40
G01     101.0          28.1               11.5 +/-    1.75      21.0 +/-    1.75  0.030 / 0.060
G07     115.7          50.4               11.1 +/-    0.72      13.9 +/-    0.72  0.040 / 0.050
G08     41.6           13.9                6.2 +/-    1.84      15.9 +/-    1.84  0.060 / 0.160
G11     78.7           40.1               10.6 +/-    0.64      15.3 +/-    0.64  0.060 / 0.120
G13     306.5          30.3                9.2 +/-    2.51      16.1 +/-    2.51  0.040 / 0.040
G17     207.8          46.1               12.5 +/-    0.67      16.6 +/-    0.67  0.050 / 0.040
G19     210.5          19.7                8.9 +/-    1.24      19.8 +/-    1.24  0.030 / 0.060
G28     329.2          61.5                9.3 +/-    0.54      10.4 +/-    0.54  0.040 / 0.060
G30     38.4           79.7               10.2 +/-    0.56      10.3 +/-    0.56  0.070 / 0.130