PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/19-20:27:00
G02     46.4           43.7                9.0 +/-    1.45      12.3 +/-    1.45  0.040 / 0.060
G05     93.2           69.4                9.7 +/-    0.61      10.3 +/-    0.61  0.050 / 0.040
G12     189.0          50.5               10.7 +/-    0.64      13.4 +/-    0.64  0.070 / 0.080
G25     266.3          58.1                9.2 +/-    1.10      10.6 +/-    1.10  0.070 / 0.090
G29     319.1          41.7                9.4 +/-    1.20      13.3 +/-    1.20  0.030 / 0.040