PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-14:43:00
G01     114.4259       20.8703         11.4294 +/-  1.6355   24.6218 +/-  1.6355  0.200 / 0.240
G07     95.6445        60.3322         12.0406 +/-  0.7712   13.6345 +/-  0.7712  0.180 / 0.240
G08     43.0412        25.4996         10.0250 +/-  2.3888   19.3659 +/-  2.3888  0.030 / 0.030
G09     175.2200       20.0913         11.2539 +/-  2.9292   24.7071 +/-  2.9292  0.030 / 0.030
G11     96.8861        39.6154         11.9073 +/-  0.4318   17.4285 +/-  0.4318  0.210 / 0.260
G13     316.2131       21.4124         10.4512 +/-  2.1309   22.2214 +/-  2.1309  0.190 / 0.280
G17     202.2889       31.8933         11.3465 +/-  0.9417   19.1172 +/-  0.9417  0.100 / 0.180
G28     301.9830       58.8264          9.1925 +/-  0.9431   10.5498 +/-  0.9431  0.100 / 0.190
G30     350.4286       70.5352         10.2538 +/-  0.7612   10.8071 +/-  0.7612  0.030 / 0.020