PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-13:42:50
G08     63.7679        47.3559          6.0595 +/-  0.6745    7.9047 +/-  0.6745  0.080 / 0.180
G09     178.3446       50.3777         10.2089 +/-  1.2384   12.8156 +/-  1.2384  0.070 / 0.160
G11     128.3984       25.6807          9.1314 +/-  1.0053   17.5673 +/-  1.0053  0.070 / 0.070
G23     160.1969       22.5415          9.2022 +/-  2.3245   19.0440 +/-  2.3245  0.050 / 0.070
G27     40.9304        17.5282          6.1287 +/-  1.1493   14.3289 +/-  1.1493  0.040 / 0.050
G28     257.1183       44.2642          6.4509 +/-  0.8578    8.7852 +/-  0.8578  0.040 / 0.070
G30     316.7441       46.9393          4.9538 +/-  0.9898    6.4985 +/-  0.9898  0.070 / 0.170