PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-17:58:00
G02     201.9948       18.9010         15.5150 +/-  2.4837   35.0691 +/-  2.4837  0.150 / 0.270
G06     169.0343       56.8699         13.8095 +/-  0.5571   16.1452 +/-  0.5571  0.280 / 0.360
G13     227.1028       11.7483         13.8409 +/-  1.4302   37.1653 +/-  1.4302  0.160 / 0.560
G17     27.8941        55.9737         11.4737 +/-  0.8792   13.5346 +/-  0.8792  0.140 / 0.550
G19     338.1463       70.4567         11.6640 +/-  0.5421   12.2988 +/-  0.5421  0.210 / 0.340
G28     90.8577        38.2905         14.4418 +/-  0.6075   21.6138 +/-  0.6075  0.190 / 0.280
G30     158.0094       14.6168         14.2756 +/-  1.6469   35.8392 +/-  1.6469  0.040 / 0.040