PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-23:57:40
G02     213.2          58.2               13.3 +/-    1.04      15.3 +/-    1.04  0.030 / 0.080
G06     67.1           76.7                9.4 +/-    0.95       9.7 +/-    0.95  0.050 / 0.080
G12     317.5          33.2                8.9 +/-    1.82      14.6 +/-    1.82  0.050 / 0.050
G17     52.1           37.8                9.1 +/-    0.41      13.7 +/-    0.41  0.040 / 0.070
G19     34.4           52.0                9.5 +/-    0.34      11.6 +/-    0.34  0.060 / 0.080
G24     269.7          42.1               10.8 +/-    1.35      15.2 +/-    1.35  0.070 / 0.070
G28     120.7          15.6               11.9 +/-    1.74      29.2 +/-    1.74  0.120 / 0.280