PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/25-16:58:00
G07     349.4          62.9               -1.4 +/-    8.84      -1.5 +/-    8.84  0.080 / 0.090
G08     93.3           52.0               12.7 +/-    1.96      15.6 +/-    1.96  0.060 / 0.090
G09     190.9          72.0               -0.1 +/-    9.62      -0.1 +/-    9.62  0.050 / 0.090
G11     142.9          15.9                7.5 +/-    7.92      18.4 +/-    7.92  0.060 / 0.090
G23     156.3          38.7                5.0 +/-    9.85       7.4 +/-    9.85  0.070 / 0.090
G27     53.9           31.4                2.3 +/-   10.15       3.9 +/-   10.15  0.070 / 0.100
G28     237.9          27.4               16.2 +/-    1.51      30.0 +/-    1.51  0.050 / 0.040
G30     305.2          38.6               11.4 +/-    2.08      17.0 +/-    2.08  0.060 / 0.040