PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-18:42:40
G02     215.3          54.7               15.0 +/-    1.02      17.9 +/-    1.02  0.050 / 0.060
G06     61.3           75.1               11.8 +/-    0.54      12.2 +/-    0.54  0.040 / 0.050
G12     318.8          36.2               10.8 +/-    1.64      16.8 +/-    1.64  0.040 / 0.070
G17     58.3           30.8               10.0 +/-    1.57      17.3 +/-    1.57  0.050 / 0.080
G19     40.7           48.3               10.2 +/-    0.84      13.2 +/-    0.84  0.050 / 0.060
G24     269.6          41.7               12.5 +/-    2.95      17.7 +/-    2.95  0.050 / 0.070
G28     122.2          14.2               11.4 +/-    1.97      28.8 +/-    1.97  0.050 / 0.100