PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-15:58:00
G01     76.6018        32.9788         13.9217 +/-  0.6789   22.9592 +/-  0.6789  0.080 / 0.140
G07     134.0924       31.9971         15.4689 +/-  1.2160   26.0090 +/-  1.2160  0.090 / 0.140
G11     56.2369        31.1041         13.2282 +/-  1.0817   22.6449 +/-  1.0817  0.040 / 0.050
G13     283.2652       36.9693         13.5590 +/-  1.3237   20.7640 +/-  1.3237  0.040 / 0.040
G15     310.3119       12.0836         12.1145 +/-  2.5964   32.2834 +/-  2.5964  0.060 / 0.150
G17     225.8901       67.0472         14.6275 +/-  0.8479   15.7427 +/-  0.8479  0.060 / 0.150
G19     220.5817       39.2676         15.8767 +/-  1.6573   23.3729 +/-  1.6573  0.070 / 0.120
G28     10.1482        60.2165         13.4409 +/-  0.7767   15.2355 +/-  0.7767  0.070 / 0.100
G30     126.7696       69.4048         14.9900 +/-  0.8025   15.8999 +/-  0.8025  0.030 / 0.030