PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-18:57:40
G02     213.7          51.8               14.0 +/-    1.65      17.3 +/-    1.65  0.040 / 0.070
G06     69.5           76.9               11.5 +/-    1.21      11.8 +/-    1.21  0.050 / 0.080
G12     318.0          34.2               10.2 +/-    1.27      16.4 +/-    1.27  0.050 / 0.110
G17     56.3           32.4                9.5 +/-    0.58      15.8 +/-    0.58  0.060 / 0.110
G19     37.9           49.9               10.0 +/-    0.63      12.6 +/-    0.63  0.050 / 0.080
G24     273.0          42.0                9.8 +/-    0.79      13.9 +/-    0.79  0.070 / 0.100
G28     120.5          16.1                9.5 +/-    0.96      23.0 +/-    0.96  0.030 / 0.030