PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-17:42:20
G02     40.3           49.6               10.6 +/-    0.46      13.4 +/-    0.46  0.030 / 0.050
G05     132.2          67.5               12.0 +/-    0.82      12.9 +/-    0.82  0.030 / 0.040
G06     58.6           10.6               10.3 +/-    2.80      28.2 +/-    2.80  0.040 / 0.060
G12     192.9          58.4               11.8 +/-    1.86      13.6 +/-    1.86  0.050 / 0.050
G20     199.6          35.3               12.9 +/-    2.28      20.4 +/-    2.28  0.110 / 0.350
G25     277.1          59.3               11.5 +/-    0.97      13.2 +/-    0.97  0.100 / 0.310
G29     315.4          38.1               10.2 +/-    1.02      15.3 +/-    1.02  0.080 / 0.150