PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-18:12:50
G01     116.7          18.9               13.7 +/-    1.57      31.0 +/-    1.57  0.060 / 0.080
G07     94.2           59.6               13.2 +/-    0.55      15.1 +/-    0.55  0.070 / 0.070
G08     44.0           29.3               10.3 +/-    2.02      18.4 +/-    2.02  0.030 / 0.040
G09     177.4          25.2               14.4 +/-    2.44      27.9 +/-    2.44  0.030 / 0.050
G11     102.4          41.3               14.4 +/-    0.62      20.6 +/-    0.62  0.030 / 0.030
G13     316.3          21.9               10.8 +/-    2.63      22.7 +/-    2.63  0.030 / 0.030
G17     201.5          26.9               15.4 +/-    1.31      28.9 +/-    1.31  0.120 / 0.360
G18     89.9           21.4               12.5 +/-    1.37      26.5 +/-    1.37  0.230 / 0.270
G28     289.4          55.3               14.0 +/-    1.86      16.6 +/-    1.86  0.140 / 0.360
G30     355.6          71.8               13.5 +/-    0.75      14.2 +/-    0.75  0.110 / 0.250