PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/17-19:12:30
G03     187.3          17.2               15.3 +/-    2.75      36.0 +/-    2.75  0.050 / 0.080
G07     291.0          37.6               13.9 +/-    1.57      21.0 +/-    1.57  0.050 / 0.070
G08     144.4          27.5               15.0 +/-    0.54      27.6 +/-    0.54  0.060 / 0.060
G09     319.9          62.8               13.5 +/-    0.98      15.0 +/-    0.98  0.040 / 0.070
G16     42.5           37.6               12.1 +/-    1.06      18.3 +/-    1.06  0.060 / 0.120
G23     121.2          75.6               13.6 +/-    0.86      14.0 +/-    0.86  0.070 / 0.120
G27     97.3           34.2               12.8 +/-    1.13      20.6 +/-    1.13  0.040 / 0.070
G30     275.6          15.7               13.4 +/-    1.41      32.9 +/-    1.41  0.040 / 0.080