PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-16:12:40
G01     68.3476        32.3048         14.0066 +/-  0.9741   23.4070 +/-  0.9741  0.060 / 0.150
G07     138.1804       25.7220         14.6098 +/-  0.8250   28.0805 +/-  0.8250  0.060 / 0.140
G11     51.3427        26.4359         12.7242 +/-  1.7254   24.0665 +/-  1.7254  0.040 / 0.040
G13     274.3653       36.6802         15.4791 +/-  1.2561   23.8262 +/-  1.2561  0.030 / 0.040
G15     304.5261       13.9965         11.7530 +/-  1.3303   29.9492 +/-  1.3303  0.110 / 0.190
G17     239.2539       73.3276         14.9032 +/-  0.5304   15.4869 +/-  0.5304  0.110 / 0.180
G19     225.8053       45.8338         16.5596 +/-  1.7660   22.0541 +/-  1.7660  0.040 / 0.130
G28     22.7103        58.7263         14.3054 +/-  0.3728   16.4328 +/-  0.3728  0.040 / 0.120
G30     136.3647       62.6867         14.6982 +/-  0.8598   16.3232 +/-  0.8598  0.040 / 0.040