PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-00:28:00
G01     104.3          27.0                9.2 +/-    1.70      17.3 +/-    1.70  0.040 / 0.040
G07     110.7          56.4                9.9 +/-    0.34      11.6 +/-    0.34  0.040 / 0.040
G08     42.0           20.2                7.4 +/-    1.89      16.1 +/-    1.89  0.220 / 0.190
G09     175.1          12.2               11.5 +/-    2.68      30.6 +/-    2.68  0.210 / 0.300
G11     89.0           43.6                9.6 +/-    1.30      13.2 +/-    1.30  0.060 / 0.080
G13     308.0          29.6                7.2 +/-    1.03      12.8 +/-    1.03  0.060 / 0.070
G17     207.6          39.0               11.3 +/-    1.70      16.7 +/-    1.70  0.070 / 0.120
G19     209.8          15.7               12.5 +/-    3.19      30.6 +/-    3.19  0.060 / 0.120
G28     324.8          61.5                7.1 +/-    0.58       8.0 +/-    0.58  0.100 / 0.130
G30     60.3           78.0                9.6 +/-    1.16       9.8 +/-    1.16  0.080 / 0.150