PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-19:42:50
G02     230.5          68.1               12.6 +/-    0.61      13.5 +/-    0.61  0.050 / 0.040
G05     175.3          11.2                7.2 +/-   33.67      19.7 +/-   33.67  0.050 / 0.040
G06     42.3           61.4               -3.3 +/-   22.07      -3.7 +/-   22.07  0.100 / 0.240
G12     322.0          50.2               10.3 +/-    0.83      13.0 +/-    0.83  0.100 / 0.300
G17     69.9           22.0                8.2 +/-    2.71      17.2 +/-    2.71  0.050 / 0.070
G19     55.8           39.0              -17.9 +/-   55.72     -26.5 +/-   55.72  0.060 / 0.080
G24     251.2          37.0               10.9 +/-    1.58      16.7 +/-    1.58  0.030 / 0.050
G25     316.3          13.5                9.2 +/-    3.15      23.7 +/-    3.15  0.030 / 0.040