PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-21:13:10
G01     48.0           23.9               11.6 +/-    1.45      23.3 +/-    1.45  0.160 / 0.240
G06     178.9          24.6               16.6 +/-    1.53      32.7 +/-    1.53  0.040 / 0.050
G11     43.8           12.6               10.4 +/-    2.41      27.5 +/-    2.41  0.040 / 0.050
G13     247.4          29.8               15.6 +/-    1.12      27.5 +/-    1.12  0.070 / 0.060
G15     280.8          15.5               12.0 +/-    1.62      29.6 +/-    1.62  0.070 / 0.070
G17     328.2          78.1               15.1 +/-    0.38      15.4 +/-    0.38  0.070 / 0.140
G19     249.5          61.8               15.7 +/-    0.54      17.6 +/-    0.54  0.090 / 0.120
G24     318.6          10.6              -16.0 +/-   18.50     -44.0 +/-   18.50  0.040 / 0.050
G28     49.5           54.9               13.6 +/-    0.78      16.3 +/-    0.78  0.040 / 0.050
G30     150.2          37.8               16.1 +/-    1.06      24.3 +/-    1.06  0.140 / 0.350