PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-20:12:30
G02     279.1          79.4               14.3 +/-    1.04      14.6 +/-    1.04  0.090 / 0.190
G05     169.7          24.9               22.4 +/-    2.15      43.9 +/-    2.15  0.090 / 0.150
G06     40.7           46.1               11.5 +/-    0.83      15.3 +/-    0.83  0.070 / 0.160
G12     318.4          66.1               11.5 +/-    0.89      12.5 +/-    0.89  0.070 / 0.150
G17     82.3           12.9               13.0 +/-    1.73      33.9 +/-    1.73  0.090 / 0.130
G19     70.5           29.5               12.8 +/-    0.67      22.7 +/-    0.67  0.070 / 0.140
G24     235.5          27.9               16.2 +/-    0.75      29.7 +/-    0.75  0.030 / 0.040
G25     317.7          27.2               10.8 +/-    1.60      20.1 +/-    1.60  0.040 / 0.040