PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-18:42:50
G02     214.0          52.7               13.7 +/-    1.26      16.7 +/-    1.26  0.050 / 0.080
G06     67.3           76.5               10.7 +/-    0.66      11.0 +/-    0.66  0.060 / 0.080
G12     318.2          34.6                9.2 +/-    1.56      14.8 +/-    1.56  0.060 / 0.110
G17     56.8           32.0                8.7 +/-    0.53      14.6 +/-    0.53  0.040 / 0.110
G19     38.6           49.5                8.7 +/-    0.79      11.0 +/-    0.79  0.040 / 0.090
G24     272.2          41.9                9.8 +/-    1.09      13.8 +/-    1.09  0.040 / 0.090
G28     120.9          15.6                9.8 +/-    1.35      24.1 +/-    1.35  0.030 / 0.030