PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-09:27:50
G08     270.5          19.7                4.9 +/-    2.84      10.9 +/-    2.84  0.030 / 0.060
G10     56.0           58.8                3.4 +/-    0.68       3.9 +/-    0.68  0.030 / 0.040
G14     259.5          64.9                4.1 +/-    0.36       4.4 +/-    0.36  0.100 / 0.270
G18     313.6          30.8                5.8 +/-    1.28       9.9 +/-    1.28  0.090 / 0.210
G20     92.0           38.8                5.3 +/-    0.50       7.9 +/-    0.50  0.120 / 0.220
G21     153.9          17.3                3.0 +/-    3.16       7.1 +/-    3.16  0.140 / 0.280
G24     40.8           11.4                2.8 +/-    2.29       7.4 +/-    2.29  0.040 / 0.060
G27     236.0          18.9                6.4 +/-    1.20      14.4 +/-    1.20  0.040 / 0.060
G31     179.5          26.0                4.6 +/-    1.53       8.7 +/-    1.53  0.150 / 0.270
G32     304.4          74.6                5.3 +/-    0.75       5.5 +/-    0.75  0.130 / 0.250