PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-19:57:50
G02     239.8372       72.4678         16.0143 +/-  0.6501   16.7101 +/-  0.6501  0.110 / 0.180
G05     173.4432       15.4349         23.3106 +/-  1.4686   57.3718 +/-  1.4686  0.110 / 0.170
G06     40.7571        56.3606         14.7061 +/-  0.4997   17.2803 +/-  0.4997  0.080 / 0.130
G12     322.0321       55.2824         14.5000 +/-  1.1677   17.2260 +/-  1.1677  0.080 / 0.150
G17     73.8756        19.0906         13.3350 +/-  1.4501   30.0018 +/-  1.4501  0.070 / 0.100
G19     60.6078        35.8853         14.0686 +/-  1.0113   21.9669 +/-  1.0113  0.060 / 0.100
G24     245.6626       34.4230         16.0230 +/-  0.9308   25.7040 +/-  0.9308  0.030 / 0.050
G25     317.1892       17.7078         14.4876 +/-  1.8384   33.7221 +/-  1.8384  0.030 / 0.050