PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-18:28:10
G01     126.0          11.8                0.4 +/-   41.37       1.1 +/-   41.37  0.030 / 0.030
G07     69.6           65.8               12.9 +/-    0.38      14.0 +/-    0.38  0.030 / 0.030
G08     49.6           38.3               11.8 +/-    1.19      17.7 +/-    1.19  0.090 / 0.120
G09     178.8          36.7               14.4 +/-    0.90      22.2 +/-    0.90  0.070 / 0.110
G11     116.1          36.4               14.9 +/-    1.88      23.0 +/-    1.88  0.030 / 0.030
G13     320.6          13.0               11.0 +/-    4.35      28.7 +/-    4.35  0.040 / 0.040
G17     199.3          16.0               15.8 +/-    1.61      38.3 +/-    1.61  0.260 / 0.350
G18     100.8          16.9               12.2 +/-    1.24      29.0 +/-    1.24  0.310 / 0.350
G28     272.2          49.8               14.0 +/-    3.12      17.7 +/-    3.12  0.070 / 0.070
G30     335.9          62.5               12.2 +/-    0.68      13.6 +/-    0.68  0.070 / 0.090