PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-01:42:30
G08     305.0          21.1                5.9 +/-    1.45      12.7 +/-    1.45  0.040 / 0.060
G10     336.7          60.6                8.5 +/-    0.43       9.6 +/-    0.43  0.040 / 0.060
G14     220.2          35.8               11.7 +/-    1.49      18.3 +/-    1.49  0.050 / 0.070
G18     42.6           58.5                8.0 +/-    0.92       9.2 +/-    0.92  0.060 / 0.070
G21     137.0          53.3               11.3 +/-    0.84      13.7 +/-    0.84  0.030 / 0.040
G24     71.6           30.4                9.3 +/-    0.54      16.2 +/-    0.54  0.030 / 0.040
G27     268.4          36.8                9.9 +/-    1.06      15.2 +/-    1.06  0.080 / 0.090
G32     226.7          53.9               10.5 +/-    0.76      12.6 +/-    0.76  0.050 / 0.080