PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/20-19:57:20
G02     36.7           51.8                8.4 +/-    1.06      10.4 +/-    1.06  0.030 / 0.040
G05     127.0          66.4                9.6 +/-    0.41      10.4 +/-    0.41  0.040 / 0.040
G06     56.6           11.3                8.0 +/-    3.16      21.6 +/-    3.16  0.040 / 0.040
G12     194.9          62.9                9.5 +/-    0.44      10.6 +/-    0.44  0.040 / 0.050
G25     288.7          55.9                6.3 +/-    1.60       7.5 +/-    1.60  0.050 / 0.060
G29     311.5          32.8                7.8 +/-    1.28      12.9 +/-    1.28  0.050 / 0.060