PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/14-17:57:30
G07     2.7            65.4                9.9 +/-    0.31      10.8 +/-    0.31  0.030 / 0.040
G08     80.7           51.8               10.2 +/-    0.61      12.6 +/-    0.61  0.030 / 0.050
G09     184.8          64.4               10.7 +/-    0.63      11.7 +/-    0.63  0.030 / 0.030
G11     138.1          20.4               11.6 +/-    2.02      25.3 +/-    2.02  0.040 / 0.030
G23     158.3          32.0               10.4 +/-    1.04      17.5 +/-    1.04  0.130 / 0.130
G27     48.3           27.4                7.8 +/-    2.43      14.4 +/-    2.43  0.100 / 0.160
G28     243.7          32.9               11.4 +/-    1.89      18.9 +/-    1.89  0.070 / 0.080
G30     310.6          43.0                9.9 +/-    0.87      13.7 +/-    0.87  0.060 / 0.070