PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-13:57:30
G01     73.0           32.9                8.2 +/-    0.95      13.5 +/-    0.95  0.050 / 0.100
G07     136.1          30.0                8.3 +/-    1.05      14.6 +/-    1.05  0.050 / 0.090
G11     54.2           29.6                6.9 +/-    0.70      12.1 +/-    0.70  0.070 / 0.140
G13     279.6          36.9                7.0 +/-    0.65      10.8 +/-    0.65  0.080 / 0.120
G15     306.6          13.8                4.0 +/-    1.75      10.3 +/-    1.75  0.040 / 0.040
G17     231.1          70.0                7.6 +/-    0.89       8.0 +/-    0.89  0.040 / 0.040
G19     222.8          42.1                9.0 +/-    1.32      12.7 +/-    1.32  0.050 / 0.070
G28     16.3           59.6                6.9 +/-    0.76       7.9 +/-    0.76  0.050 / 0.080
G30     131.8          65.9                7.8 +/-    0.61       8.5 +/-    0.61  0.030 / 0.050