PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-17:13:00
G01     43.6593        19.2878         12.3320 +/-  0.6450   27.6111 +/-  0.6450  0.070 / 0.240
G06     175.5466       34.7397         14.4250 +/-  1.2955   23.0035 +/-  1.2955  0.100 / 0.240
G13     243.5540       25.0818         14.5110 +/-  1.0335   28.3004 +/-  1.0335  0.030 / 0.040
G15     279.0259       13.4616         13.5407 +/-  1.0417   34.9463 +/-  1.0417  0.030 / 0.040
G17     359.0446       72.4953         14.0712 +/-  0.7434   14.6806 +/-  0.7434  0.130 / 0.270
G19     268.8043       68.5970         13.1183 +/-  0.7700   13.9815 +/-  0.7700  0.130 / 0.360
G24     318.4489       13.9686         12.3471 +/-  1.6442   31.4840 +/-  1.6442  0.060 / 0.100
G28     65.6177        48.9681         13.4615 +/-  0.4781   17.1969 +/-  0.4781  0.060 / 0.070
G30     153.5545       34.5651         14.3735 +/-  1.3227   22.9965 +/-  1.3227  0.070 / 0.180