PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/17-22:42:50
G02     215.9          60.8               15.1 +/-    0.99      17.0 +/-    0.99  0.070 / 0.070
G06     56.9           73.7               12.5 +/-    0.40      13.0 +/-    0.40  0.050 / 0.060
G12     318.8          36.7               10.2 +/-    1.73      15.8 +/-    1.73  0.060 / 0.080
G17     55.6           35.0               10.9 +/-    1.71      17.4 +/-    1.71  0.070 / 0.070
G19     37.7           50.3               11.6 +/-    1.77      14.6 +/-    1.77  0.030 / 0.020
G24     265.1          41.6               14.4 +/-    1.57      20.4 +/-    1.57  0.030 / 0.020
G28     122.8          13.4               16.3 +/-    1.84      42.0 +/-    1.84  0.120 / 0.310