PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-16:27:50
G02     204.3          33.2               18.5 +/-    1.54      30.3 +/-    1.54  0.080 / 0.120
G03     58.1           9.8                11.0 +/-    0.99      31.0 +/-    0.99  0.080 / 0.120
G06     157.9          70.4               15.8 +/-    0.52      16.7 +/-    0.52  0.080 / 0.090
G12     308.7          16.8               10.8 +/-    2.54      25.8 +/-    2.54  0.090 / 0.080
G17     39.8           46.0               12.2 +/-    1.09      16.1 +/-    1.09  0.290 / 0.200
G19     9.1            63.4               13.9 +/-    0.56      15.3 +/-    0.56  0.120 / 0.200
G24     298.5          37.6               11.8 +/-    2.17      17.8 +/-    2.17  0.050 / 0.050
G28     104.2          30.0               12.1 +/-    1.07      21.3 +/-    1.07  0.040 / 0.060