PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-13:27:30
G01     87.5           32.1                6.9 +/-    1.51      11.6 +/-    1.51  0.030 / 0.030
G07     127.5          40.8                8.3 +/-    0.69      11.9 +/-    0.69  0.030 / 0.040
G11     64.9           36.5                5.7 +/-    0.75       8.9 +/-    0.75  0.030 / 0.070
G13     294.4          35.3                7.4 +/-    0.71      11.7 +/-    0.71  0.030 / 0.060
G17     215.8          58.3                9.4 +/-    0.70      10.8 +/-    0.70  0.050 / 0.120
G19     215.4          30.8                8.4 +/-    1.34      14.5 +/-    1.34  0.050 / 0.120
G28     353.6          61.4                6.9 +/-    0.96       7.8 +/-    0.96  0.030 / 0.040
G30     105.2          76.4                7.6 +/-    0.47       7.8 +/-    0.47  0.030 / 0.050