PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-13:12:50
G01     95.6           30.1                6.0 +/-    0.94      10.4 +/-    0.94  0.030 / 0.040
G07     121.1          46.8                7.1 +/-    1.84       9.4 +/-    1.84  0.030 / 0.030
G11     72.8           39.2                6.0 +/-    0.73       8.9 +/-    0.73  0.040 / 0.050
G13     301.9          32.7                6.2 +/-    1.49      10.2 +/-    1.49  0.040 / 0.050
G17     210.6          51.3               10.3 +/-    1.70      12.7 +/-    1.70  0.060 / 0.150
G19     212.3          24.3               10.0 +/-    1.91      19.8 +/-    1.91  0.060 / 0.160
G28     339.7          61.7                5.7 +/-    0.51       6.4 +/-    0.51  0.040 / 0.060
G30     71.5           79.9                5.4 +/-    0.47       5.4 +/-    0.47  0.040 / 0.060