PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-19:13:10
G01     108.3          24.3               13.7 +/-    1.59      27.3 +/-    1.59  0.040 / 0.060
G07     108.2          53.5               15.4 +/-    0.38      18.6 +/-    0.38  0.040 / 0.060
G08     41.9           21.2               10.4 +/-    0.57      22.2 +/-    0.57  0.030 / 0.050
G09     175.9          16.5               16.2 +/-    2.83      38.7 +/-    2.83  0.030 / 0.060
G11     89.6           42.9               15.1 +/-    0.43      21.0 +/-    0.43  0.040 / 0.030
G13     310.6          28.3               11.8 +/-    1.44      21.4 +/-    1.44  0.030 / 0.030
G17     204.2          36.6               16.3 +/-    2.09      25.2 +/-    2.09  0.070 / 0.210
G18     79.9           23.5               11.8 +/-    0.61      23.8 +/-    0.61  0.080 / 0.170
G28     305.8          58.7               13.3 +/-    0.41      15.2 +/-    0.41  0.060 / 0.160
G30     23.5           77.7               13.8 +/-    0.73      14.1 +/-    0.73  0.060 / 0.180