PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/21-21:42:40
G02     32.1           55.7                6.7 +/-    0.96       7.9 +/-    0.96  0.050 / 0.050
G05     138.2          62.0                9.9 +/-    0.59      11.0 +/-    0.59  0.040 / 0.060
G06     53.0           16.4                7.1 +/-    1.70      17.0 +/-    1.70  0.040 / 0.040
G12     203.9          70.0                9.8 +/-    0.67      10.3 +/-    0.67  0.040 / 0.050
G25     298.0          52.8                8.7 +/-    1.96      10.6 +/-    1.96  0.030 / 0.030
G29     307.6          29.1                7.7 +/-    1.79      13.7 +/-    1.79  0.020 / 0.030