PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/11-17:57:40
G01     127.9          11.1               19.1 +/-    5.96      52.2 +/-    5.96  0.040 / 0.040
G07     48.1           69.8               15.6 +/-    0.53      16.5 +/-    0.53  0.050 / 0.060
G08     52.8           42.8               13.3 +/-    1.09      18.6 +/-    1.09  0.030 / 0.040
G09     178.5          37.4               17.7 +/-    1.24      26.9 +/-    1.24  0.030 / 0.030
G11     120.7          34.4               18.6 +/-    0.84      29.8 +/-    0.84  0.030 / 0.040
G17     201.0          11.0                0.6 +/-   35.91       1.7 +/-   35.91  0.030 / 0.030
G18     105.2          16.1               16.6 +/-    2.36      40.1 +/-    2.36  0.130 / 0.300
G28     275.0          52.6               15.2 +/-    3.24      18.6 +/-    3.24  0.130 / 0.230
G30     333.3          60.5               14.6 +/-    0.58      16.5 +/-    0.58  0.250 / 0.360