PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-20:57:40
G01     40.8           16.2               10.7 +/-    1.97      25.8 +/-    1.97  0.130 / 0.350
G06     176.5          36.6               14.6 +/-    2.02      22.5 +/-    2.02  0.130 / 0.350
G13     237.0          22.7               15.5 +/-    3.44      32.0 +/-    3.44  0.040 / 0.070
G15     270.3          12.4               14.4 +/-    2.12      38.1 +/-    2.12  0.040 / 0.070
G17     2.1            70.6               13.1 +/-    0.55      13.8 +/-    0.55  0.130 / 0.300
G19     276.2          69.3               12.6 +/-    0.60      13.4 +/-    0.60  0.130 / 0.290
G24     316.2          19.7               12.1 +/-    1.79      26.7 +/-    1.79  0.100 / 0.280
G28     66.3           50.4               13.4 +/-    0.83      16.8 +/-    0.83  0.120 / 0.300
G30     153.9          26.1               14.9 +/-    1.90      28.5 +/-    1.90  0.070 / 0.100