PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/22-17:57:50
G07     42.0           67.9               11.6 +/-    0.78      12.4 +/-    0.78  0.040 / 0.040
G08     59.1           45.8               10.2 +/-    0.59      13.6 +/-    0.59  0.030 / 0.030
G09     180.3          47.9               13.1 +/-    0.74      17.0 +/-    0.74  0.130 / 0.130
G11     126.4          30.3               13.5 +/-    1.17      23.5 +/-    1.17  0.120 / 0.150
G18     110.1          11.8               13.2 +/-    1.96      35.4 +/-    1.96  0.040 / 0.050
G23     160.3          16.8               12.1 +/-    1.24      28.7 +/-    1.24  0.030 / 0.040
G27     40.0           16.4                8.0 +/-    2.69      19.2 +/-    2.69  0.120 / 0.240
G28     258.9          43.4               12.9 +/-    2.18      17.8 +/-    2.18  0.170 / 0.180
G30     324.4          54.4               10.4 +/-    0.66      12.5 +/-    0.66  0.140 / 0.300