PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-18:42:40
G07     10.6           67.5               12.8 +/-    0.69      13.8 +/-    0.69  0.050 / 0.050
G08     69.2           51.7               12.2 +/-    0.70      15.1 +/-    0.70  0.040 / 0.040
G09     180.8          51.8               15.8 +/-    0.96      19.5 +/-    0.96  0.100 / 0.170
G11     133.0          26.0               14.4 +/-    2.87      27.5 +/-    2.87  0.180 / 0.250
G23     158.3          16.8               14.3 +/-    0.72      34.2 +/-    0.72  0.040 / 0.040
G27     40.9           17.9               10.6 +/-    2.41      24.6 +/-    2.41  0.040 / 0.050
G28     257.5          44.8               14.5 +/-    3.24      19.7 +/-    3.24  0.030 / 0.030
G30     320.5          50.8               13.0 +/-    0.48      16.2 +/-    0.48  0.030 / 0.030