PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-18:58:30
G01     114.7          20.3               14.5 +/-    0.93      31.7 +/-    0.93  0.040 / 0.050
G07     97.8           58.4               14.5 +/-    0.52      16.7 +/-    0.52  0.040 / 0.060
G08     43.2           27.0               10.9 +/-    1.39      20.4 +/-    1.39  0.030 / 0.050
G09     177.0          22.9               13.9 +/-    1.60      28.6 +/-    1.60  0.040 / 0.050
G11     99.2           41.9               15.2 +/-    0.65      21.5 +/-    0.65  0.030 / 0.030
G13     315.1          23.6               11.4 +/-    2.60      23.1 +/-    2.60  0.040 / 0.040
G17     202.0          29.5               16.5 +/-    1.51      29.2 +/-    1.51  0.080 / 0.210
G18     87.3           22.0               13.3 +/-    1.55      27.8 +/-    1.55  0.080 / 0.160
G28     293.5          56.3               13.6 +/-    0.65      16.0 +/-    0.65  0.070 / 0.310
G30     0.1            73.3               13.5 +/-    0.61      14.0 +/-    0.61  0.080 / 0.260