PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-17:57:40
G02     202.3          20.7               14.0 +/-    2.45      30.3 +/-    2.45  0.120 / 0.320
G06     168.0          58.9               15.2 +/-    0.91      17.4 +/-    0.91  0.320 / 0.430
G13     225.8          10.5               13.3 +/-    5.52      36.7 +/-    5.52  0.060 / 0.100
G17     29.7           54.5                9.5 +/-    1.08      11.4 +/-    1.08  0.060 / 0.090
G19     343.6          69.7               13.5 +/-    0.81      14.3 +/-    0.81  0.040 / 0.040
G24     308.5          31.1                9.8 +/-    2.00      16.8 +/-    2.00  0.060 / 0.050
G28     92.9           37.2               11.0 +/-    0.85      16.8 +/-    0.85  0.070 / 0.300
G30     158.2          12.9               14.7 +/-    5.98      38.5 +/-    5.98  0.060 / 0.260