PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-19:12:50
G01     75.8           33.3               11.9 +/-    0.59      19.5 +/-    0.59  0.030 / 0.090
G07     134.9          35.2               14.4 +/-    1.41      22.8 +/-    1.41  0.050 / 0.080
G11     57.4           34.1                9.7 +/-    0.77      15.6 +/-    0.77  0.090 / 0.200
G13     279.9          37.8               13.9 +/-    0.80      21.0 +/-    0.80  0.080 / 0.230
G15     306.6          14.0                9.6 +/-    1.94      24.4 +/-    1.94  0.040 / 0.070
G17     226.5          62.1               16.8 +/-    0.64      18.7 +/-    0.64  0.030 / 0.030
G18     52.7           20.3                9.3 +/-    1.24      20.4 +/-    1.24  0.050 / 0.050
G19     221.3          36.6               16.9 +/-    1.64      26.0 +/-    1.64  0.040 / 0.050
G28     12.5           60.1               10.4 +/-    0.58      11.8 +/-    0.58  0.050 / 0.120
G30     130.6          65.0               14.0 +/-    0.68      15.3 +/-    0.68  0.050 / 0.140