PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-16:43:10
G01     53.5009        27.2880         11.6741 +/-  2.4889   21.6669 +/-  2.4889  0.090 / 0.220
G06     178.3548       21.5383         13.5833 +/-  1.2326   28.7936 +/-  1.2326  0.100 / 0.300
G07     144.4119       12.8215         12.8411 +/-  3.4262   33.6425 +/-  3.4262  0.080 / 0.170
G11     44.9694        15.5012         13.1068 +/-  1.2855   32.2061 +/-  1.2855  0.090 / 0.160
G13     257.0262       32.3219         12.3231 +/-  2.2009   20.5866 +/-  2.2009  0.050 / 0.120
G15     291.4846       15.3189         11.5949 +/-  1.8284   28.6180 +/-  1.8284  0.090 / 0.110
G17     305.7359       79.8879         13.1725 +/-  0.7472   13.3588 +/-  0.7472  0.180 / 0.170
G19     241.7863       58.8004         13.7316 +/-  2.0214   15.7629 +/-  2.0214  0.090 / 0.170
G28     46.3019        54.3703         13.0248 +/-  0.9432   15.6228 +/-  0.9432  0.030 / 0.040
G30     147.6579       48.1364         13.3110 +/-  0.8980   17.1871 +/-  0.8980  0.030 / 0.040