PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-16:12:30
G07     338.3          59.9               12.1 +/-    0.72      13.7 +/-    0.72  0.040 / 0.040
G08     95.4           53.3               12.0 +/-    0.75      14.6 +/-    0.75  0.030 / 0.050
G09     186.8          69.3               12.9 +/-    1.43      13.7 +/-    1.43  0.030 / 0.050
G11     143.9          15.5               11.9 +/-    1.57      29.2 +/-    1.57  0.040 / 0.050
G23     155.4          33.4               12.3 +/-    0.89      20.2 +/-    0.89  0.060 / 0.080
G27     51.2           29.3               10.2 +/-    0.77      18.2 +/-    0.77  0.050 / 0.070
G28     240.8          32.9               14.1 +/-    0.95      23.3 +/-    0.95  0.170 / 0.310
G30     305.7          38.4               10.8 +/-    1.10      16.1 +/-    1.10  0.150 / 0.280