PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-23:57:40
G02     214.6          60.1               13.4 +/-    0.46      15.2 +/-    0.46  0.040 / 0.100
G06     60.9           75.2                9.7 +/-    0.65      10.0 +/-    0.65  0.040 / 0.080
G12     318.2          34.9                8.7 +/-    1.55      13.8 +/-    1.55  0.130 / 0.320
G17     53.8           36.6                8.0 +/-    1.20      12.3 +/-    1.20  0.190 / 0.330
G19     36.7           50.8                8.3 +/-    0.57      10.4 +/-    0.57  0.070 / 0.080
G24     267.1          41.8               11.8 +/-    1.21      16.6 +/-    1.21  0.060 / 0.100
G28     122.0          14.3               13.0 +/-    1.09      32.9 +/-    1.09  0.030 / 0.050