PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/28-13:28:00
G02     45.6           43.8                3.1 +/-    0.64       4.2 +/-    0.64  0.030 / 0.040
G05     114.8          70.7                4.7 +/-    0.45       5.0 +/-    0.45  0.030 / 0.030
G12     185.3          50.1                6.1 +/-    1.56       7.7 +/-    1.56  0.050 / 0.060
G25     271.1          58.3                5.5 +/-    0.79       6.3 +/-    0.79  0.050 / 0.050
G29     316.4          38.1                3.5 +/-    0.82       5.3 +/-    0.82  0.040 / 0.040