PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/17-17:57:40
G01     119.0          18.1               14.4 +/-    1.52      33.2 +/-    1.52  0.040 / 0.080
G07     80.3           66.8               13.5 +/-    0.40      14.6 +/-    0.40  0.050 / 0.060
G08     45.6           33.5               10.9 +/-    0.42      17.8 +/-    0.42  0.040 / 0.040
G09     177.0          25.9               14.9 +/-    1.72      28.6 +/-    1.72  0.030 / 0.040
G11     107.7          40.0               14.3 +/-    0.55      20.8 +/-    0.55  0.040 / 0.060
G13     317.7          19.4               13.5 +/-    1.47      30.2 +/-    1.47  0.060 / 0.070
G17     202.7          22.0               15.4 +/-    1.04      32.4 +/-    1.04  0.020 / 0.040
G18     94.4           21.0               14.5 +/-    1.10      31.2 +/-    1.10  0.020 / 0.050
G28     293.5          57.6               13.8 +/-    1.14      16.0 +/-    1.14  0.050 / 0.100
G30     349.1          69.4               13.4 +/-    0.64      14.2 +/-    0.64  0.050 / 0.090