PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-00:27:50
G02     90.0869        10.4662          9.6017 +/-  1.3929   26.5192 +/-  1.3929  0.140 / 0.250
G05     46.1878        26.2834          8.4770 +/-  1.3119   16.0883 +/-  1.3119  0.160 / 0.320
G13     87.9207        36.8143         11.2436 +/-  0.7460   17.2655 +/-  0.7460  0.060 / 0.120
G15     139.0084       45.2653         13.5589 +/-  1.3538   18.2022 +/-  1.3538  0.060 / 0.110
G18     238.0612       34.0767         15.0448 +/-  1.6765   24.2933 +/-  1.6765  0.030 / 0.030
G20     22.4282        72.9122         10.0271 +/-  0.5686   10.4403 +/-  0.5686  0.020 / 0.030
G21     305.0046       41.6982         11.0257 +/-  0.6192   15.6075 +/-  0.6192  0.150 / 0.220
G25     199.9976       14.7945         15.3476 +/-  1.9872   38.3654 +/-  1.9872  0.130 / 0.230
G26     297.0619       19.8855         11.3414 +/-  1.7356   25.0246 +/-  1.7356  0.040 / 0.090
G29     145.2773       79.6718          9.2804 +/-  0.7113    9.4174 +/-  0.7113  0.050 / 0.100