PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/19-18:28:00
G01     127.8          10.3              -16.2 +/-   33.11     -45.0 +/-   33.11  0.130 / 0.660
G07     63.6           66.6               12.5 +/-    0.70      13.5 +/-    0.70  0.130 / 0.500
G08     51.3           40.1               12.2 +/-    0.61      17.6 +/-    0.61  0.040 / 0.040
G09     179.1          39.1               16.0 +/-    0.52      23.7 +/-    0.52  0.040 / 0.040
G11     118.6          35.1               15.3 +/-    0.92      24.2 +/-    0.92  0.030 / 0.050
G13     321.2          11.1               -5.0 +/-   22.68     -13.6 +/-   22.68  0.040 / 0.040
G17     199.1          13.8               14.7 +/-    4.63      37.6 +/-    4.63  0.050 / 0.070
G18     103.0          15.8               13.7 +/-    0.91      33.3 +/-    0.91  0.060 / 0.100
G28     269.1          48.5               13.5 +/-    0.82      17.4 +/-    0.82  0.230 / 0.000
G30     333.0          60.6               11.5 +/-    0.87      13.0 +/-    0.87  0.240 / 0.440