PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-20:12:30
G02     260.8192       77.5318         14.0857 +/-  0.3508   14.3903 +/-  0.3508  0.030 / 0.030
G05     170.9760       21.5019         20.7042 +/-  2.0082   43.9266 +/-  2.0082  0.030 / 0.030
G06     40.3728        49.6222         13.3933 +/-  0.6232   16.9699 +/-  0.6232  0.040 / 0.040
G12     320.4704       62.3395         13.0473 +/-  0.7241   14.5298 +/-  0.7241  0.030 / 0.030
G17     79.3344        15.0886         13.3795 +/-  1.8381   33.2082 +/-  1.8381  0.100 / 0.150
G19     67.0561        31.7092         13.6777 +/-  2.3620   23.1302 +/-  2.3620  0.130 / 0.170
G25     317.7361       23.7370         14.4935 +/-  1.2277   29.1602 +/-  1.2277  0.130 / 0.190