PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-18:27:50
G02     211.0          47.7               14.0 +/-    0.69      18.2 +/-    0.69  0.060 / 0.060
G06     91.0           79.1               11.7 +/-    0.32      11.9 +/-    0.32  0.050 / 0.060
G12     316.3          30.1               12.7 +/-    1.09      22.1 +/-    1.09  0.090 / 0.110
G17     52.8           35.3               10.0 +/-    0.96      15.8 +/-    0.96  0.070 / 0.110
G19     32.6           52.9               11.6 +/-    1.11      14.1 +/-    1.11  0.050 / 0.070
G24     279.1          42.0               13.0 +/-    2.82      18.3 +/-    2.82  0.070 / 0.070
G28     117.3          19.3               10.2 +/-    2.41      22.8 +/-    2.41  0.050 / 0.060