PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-19:27:30
G02     243.3          74.0               12.8 +/-    0.64      13.3 +/-    0.64  0.030 / 0.030
G05     173.3          16.2               18.3 +/-    1.81      44.1 +/-    1.81  0.040 / 0.030
G06     40.5           55.3               11.3 +/-    0.56      13.4 +/-    0.56  0.050 / 0.040
G12     321.8          56.2               11.6 +/-    0.62      13.6 +/-    0.62  0.040 / 0.040
G17     74.9           18.3                9.5 +/-    1.80      21.7 +/-    1.80  0.160 / 0.360
G19     61.8           35.1                9.9 +/-    1.22      15.7 +/-    1.22  0.180 / 0.220
G24     244.4          33.7               14.9 +/-    1.52      24.3 +/-    1.52  0.070 / 0.070
G25     317.3          19.2               10.7 +/-    2.49      24.0 +/-    2.49  0.060 / 0.100