PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-21:28:10
G02     199.8          19.1               17.6 +/-    1.45      39.5 +/-    1.45  0.070 / 0.180
G06     170.9          52.0               15.1 +/-    1.26      18.6 +/-    1.26  0.080 / 0.180
G13     229.1          14.6               16.5 +/-    2.20      41.6 +/-    2.20  0.040 / 0.080
G17     13.3           64.1               10.7 +/-    0.68      11.8 +/-    0.68  0.050 / 0.080
G19     310.3          70.9               11.8 +/-    0.96      12.4 +/-    0.96  0.100 / 0.290
G24     311.4          28.1               11.0 +/-    1.68      20.1 +/-    1.68  0.090 / 0.290
G28     85.6           40.8               13.0 +/-    0.77      18.7 +/-    0.77  0.080 / 0.180
G30     156.6          16.0               15.2 +/-    1.79      36.8 +/-    1.79  0.080 / 0.160