PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-13:58:10
G01     72.4           32.9                7.7 +/-    1.12      12.7 +/-    1.12  0.050 / 0.090
G07     136.3          29.6                9.4 +/-    0.98      16.5 +/-    0.98  0.090 / 0.100
G11     53.8           29.3                8.3 +/-    1.53      14.7 +/-    1.53  0.120 / 0.180
G13     279.0          36.9                6.9 +/-    0.84      10.5 +/-    0.84  0.140 / 0.200
G15     306.2          13.9                4.5 +/-    1.76      11.5 +/-    1.76  0.040 / 0.030
G17     232.0          70.5                8.6 +/-    0.64       9.1 +/-    0.64  0.030 / 0.020
G19     223.1          42.6                9.2 +/-    1.92      12.8 +/-    1.92  0.030 / 0.030
G28     17.1           59.5                8.4 +/-    0.76       9.6 +/-    0.76  0.030 / 0.030
G30     132.5          65.5                9.0 +/-    0.68       9.8 +/-    0.68  0.050 / 0.070