PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-19:57:30
G02     239.8372       72.4678         15.3923 +/-  0.6665   16.0610 +/-  0.6665  0.030 / 0.030
G05     173.4432       15.4349         21.4190 +/-  1.6095   52.7160 +/-  1.6095  0.030 / 0.030
G06     40.7571        56.3606         13.8845 +/-  0.3750   16.3150 +/-  0.3750  0.060 / 0.040
G12     322.0321       55.2824         13.8768 +/-  0.8444   16.4857 +/-  0.8444  0.030 / 0.040
G17     73.8756        19.0906         12.5845 +/-  1.5410   28.3132 +/-  1.5410  0.400 / 0.210
G19     60.6078        35.8853         12.9893 +/-  0.4256   20.2816 +/-  0.4256  0.100 / 0.190
G25     317.1892       17.7078         15.0012 +/-  2.8238   34.9176 +/-  2.8238  0.120 / 0.190