PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-18:12:30
G02     263.1          78.7               16.2 +/-    0.61      16.5 +/-    0.61  0.030 / 0.030
G05     172.5          19.8               19.0 +/-    2.22      41.9 +/-    2.22  0.030 / 0.030
G06     40.2           50.9               14.7 +/-    0.65      18.3 +/-    0.65  0.160 / 0.120
G12     320.6          60.5               14.9 +/-    0.88      16.8 +/-    0.88  0.140 / 0.150
G17     78.8           15.4               12.0 +/-    0.95      29.5 +/-    0.95  0.040 / 0.040
G19     66.4           32.2               13.0 +/-    2.54      21.8 +/-    2.54  0.050 / 0.040
G24     239.5          30.7               16.5 +/-    1.63      28.4 +/-    1.63  0.170 / 0.200
G25     317.7          23.2               14.7 +/-    1.86      30.0 +/-    1.86  0.130 / 0.140