PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-14:57:50
G01     319.3          17.2                4.9 +/-    1.90      11.4 +/-    1.90  0.040 / 0.060
G08     260.7          13.5                6.8 +/-    1.41      17.5 +/-    1.41  0.050 / 0.060
G10     78.2           54.0                6.5 +/-    0.51       7.8 +/-    0.51  0.130 / 0.450
G11     306.1          20.7                7.4 +/-    2.03      16.0 +/-    2.03  0.160 / 0.390
G14     290.4          69.4                7.5 +/-    0.63       7.9 +/-    0.63  0.040 / 0.050
G22     300.6          11.4                2.6 +/-    7.78       7.2 +/-    7.78  0.040 / 0.050
G31     175.6          41.8               11.7 +/-    0.91      16.6 +/-    0.91  0.140 / 0.210
G32     7.7            67.5                6.6 +/-    1.00       7.0 +/-    1.00  0.130 / 0.180