PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-01:27:50
G01     69.7           32.8                4.4 +/-    1.05       7.2 +/-    1.05  0.030 / 0.040
G07     138.0          30.4                6.1 +/-    0.76      10.6 +/-    0.76  0.030 / 0.040
G11     54.9           32.3                3.7 +/-    1.65       6.2 +/-    1.65  0.060 / 0.070
G13     274.2          37.1                5.9 +/-    3.32       9.0 +/-    3.32  0.050 / 0.070
G15     301.0          15.9                3.1 +/-    1.65       7.5 +/-    1.65  0.040 / 0.040
G17     234.6          68.1                6.0 +/-    0.48       6.5 +/-    0.48  0.040 / 0.030
G19     225.1          43.2                7.2 +/-    2.23      10.0 +/-    2.23  0.080 / 0.070
G28     22.4           58.8                2.9 +/-    2.59       3.3 +/-    2.59  0.080 / 0.080
G30     136.1          56.4                6.9 +/-    0.78       8.1 +/-    0.78  0.070 / 0.110