PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-18:58:10
G01     114.7          20.3               13.3 +/-    1.42      29.1 +/-    1.42  0.030 / 0.040
G07     97.8           58.4               14.6 +/-    0.50      16.9 +/-    0.50  0.040 / 0.040
G08     43.2           27.0               10.0 +/-    1.52      18.7 +/-    1.52  0.060 / 0.060
G09     177.0          22.9               15.1 +/-    1.32      30.9 +/-    1.32  0.050 / 0.070
G11     99.2           41.9               14.9 +/-    0.63      21.0 +/-    0.63  0.040 / 0.030
G13     315.1          23.6               11.3 +/-    2.06      22.9 +/-    2.06  0.030 / 0.030
G17     202.0          29.5               15.2 +/-    1.45      26.9 +/-    1.45  0.110 / 0.240
G18     87.3           22.0               12.3 +/-    2.74      25.7 +/-    2.74  0.120 / 0.310
G28     293.5          56.3               13.6 +/-    1.49      15.9 +/-    1.49  0.130 / 0.150
G30     0.1            73.3               13.8 +/-    0.64      14.4 +/-    0.64  0.160 / 0.170