PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-15:28:00
G01     314.1          26.5                5.4 +/-    2.15      10.2 +/-    2.15  0.160 / 0.260
G10     94.9           47.0                7.4 +/-    0.65       9.8 +/-    0.65  0.120 / 0.290
G11     295.2          25.4                7.1 +/-    1.88      13.7 +/-    1.88  0.050 / 0.040
G14     326.6          70.2                7.4 +/-    0.85       7.9 +/-    0.85  0.040 / 0.040
G22     306.2          19.8                6.9 +/-    2.42      15.3 +/-    2.42  0.120 / 0.200
G25     92.2           13.3               10.3 +/-    1.26      26.7 +/-    1.26  0.120 / 0.230
G31     171.9          54.9               10.2 +/-    1.16      12.1 +/-    1.16  0.050 / 0.060
G32     25.9           58.9                6.5 +/-    0.78       7.5 +/-    0.78  0.040 / 0.050