PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-21:42:30
G02     31.4           57.1               10.7 +/-    0.89      12.5 +/-    0.89  0.050 / 0.050
G05     141.5          63.1               11.3 +/-    0.42      12.5 +/-    0.42  0.050 / 0.040
G06     55.6           13.5                8.2 +/-    2.11      21.2 +/-    2.11  0.040 / 0.050
G12     193.9          63.7               11.2 +/-    0.36      12.3 +/-    0.36  0.050 / 0.050
G20     197.9          30.3               11.9 +/-    1.91      20.6 +/-    1.91  0.030 / 0.040
G25     287.0          58.5                7.5 +/-    2.33       8.6 +/-    2.33  0.030 / 0.040
G29     309.8          31.1                9.2 +/-    0.75      15.8 +/-    0.75  0.090 / 0.110