PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-16:42:40
G07     0.5            65.8                9.6 +/-    0.88      10.4 +/-    0.88  0.030 / 0.040
G08     74.3           52.3                9.7 +/-    0.39      11.9 +/-    0.39  0.030 / 0.040
G09     181.1          56.1               12.1 +/-    1.32      14.3 +/-    1.32  0.030 / 0.060
G11     135.6          23.4               12.5 +/-    1.36      25.5 +/-    1.36  0.030 / 0.050
G23     157.9          21.4               11.4 +/-    1.77      24.3 +/-    1.77  0.060 / 0.060
G27     43.1           21.3                8.0 +/-    1.14      17.0 +/-    1.14  0.040 / 0.050
G28     252.4          41.7               13.3 +/-    1.56      18.9 +/-    1.56  0.060 / 0.110
G30     315.7          46.8                8.4 +/-    0.86      11.0 +/-    0.86  0.050 / 0.090