PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-16:58:10
G01     47.8896        23.4503         11.8099 +/-  0.4659   23.9210 +/-  0.4659  0.060 / 0.190
G06     176.8947       28.2306         14.3340 +/-  0.9204   26.0621 +/-  0.9204  0.060 / 0.180
G11     43.4026        9.9289          11.8158 +/-  2.7325   33.0064 +/-  2.7325  0.030 / 0.040
G13     249.7046       28.8383         13.4848 +/-  1.7654   24.2003 +/-  1.7654  0.030 / 0.030
G15     284.9989       14.6995         11.7208 +/-  1.6719   29.3666 +/-  1.6719  0.110 / 0.600
G17     340.2323       77.0512         14.8696 +/-  0.6623   15.2169 +/-  0.6623  0.150 / 0.570
G19     253.6908       64.3380         13.5645 +/-  0.9001   14.8757 +/-  0.9001  0.040 / 0.060
G28     56.6084        51.7264         13.2014 +/-  0.5642   16.3087 +/-  0.5642  0.040 / 0.070
G30     151.0848       41.0743         14.9549 +/-  0.6340   21.3785 +/-  0.6340  0.120 / 0.250