PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-14:42:40
G01     112.7          22.0               10.8 +/-    0.82      22.8 +/-    0.82  0.070 / 0.230
G07     98.9           59.1                9.6 +/-    0.92      11.0 +/-    0.92  0.100 / 0.240
G08     42.6           23.9                5.8 +/-    0.72      11.7 +/-    0.72  0.040 / 0.090
G09     174.9          18.3               10.8 +/-    1.68      24.7 +/-    1.68  0.040 / 0.090
G11     94.4           40.0                8.4 +/-    0.65      12.2 +/-    0.65  0.080 / 0.110
G13     315.2          22.8                4.2 +/-    1.81       8.6 +/-    1.81  0.100 / 0.090
G17     202.9          33.8               13.1 +/-    0.86      21.2 +/-    0.86  0.090 / 0.220
G28     305.5          59.4                8.7 +/-    0.80      10.0 +/-    0.80  0.090 / 0.250
G30     354.2          72.1                8.9 +/-    1.16       9.3 +/-    1.16  0.040 / 0.030