PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-17:42:40
G01     127.7          10.4              -15.9 +/-   29.68     -43.9 +/-   29.68  0.030 / 0.040
G07     64.6           66.3               13.0 +/-    0.38      14.0 +/-    0.38  0.030 / 0.040
G08     51.5           40.4               12.0 +/-    0.55      17.3 +/-    0.55  0.050 / 0.070
G09     179.2          39.2               15.6 +/-    0.76      23.0 +/-    0.76  0.050 / 0.080
G11     118.7          35.2               15.2 +/-    0.61      24.0 +/-    0.61  0.060 / 0.120
G13     321.2          11.1               -1.3 +/-   26.68      -3.6 +/-   26.68  0.060 / 0.110
G17     199.2          13.5               15.1 +/-    1.15      39.0 +/-    1.15  0.230 / 0.350
G18     103.1          15.8               14.0 +/-    1.46      34.1 +/-    1.46  0.240 / 0.430
G28     268.9          48.3               15.8 +/-    1.09      20.3 +/-    1.09  0.130 / 0.490
G30     333.6          61.0               12.3 +/-    0.57      13.9 +/-    0.57  0.140 / 0.450