PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-18:27:40
G02     204.9905       32.2288         15.7827 +/-  1.3383   26.4148 +/-  1.3383  0.100 / 0.130
G03     57.3972        9.7276          10.5948 +/-  1.2132   29.7189 +/-  1.2132  0.090 / 0.110
G06     154.8132       71.3792         13.6782 +/-  0.6180   14.3514 +/-  0.6180  0.130 / 0.190
G12     309.4102       18.2362         13.3548 +/-  2.8526   30.6839 +/-  2.8526  0.100 / 0.140
G17     40.3500        45.6188         11.3297 +/-  0.9765   15.1342 +/-  0.9765  0.110 / 0.250
G19     10.5733        62.9141         12.1232 +/-  0.6106   13.4395 +/-  0.6106  0.100 / 0.220
G28     104.7223       29.7470         14.5542 +/-  1.0822   25.6225 +/-  1.0822  0.030 / 0.050