PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/28-20:28:00
G02     38.2           51.2                9.4 +/-    0.57      11.7 +/-    0.57  0.030 / 0.040
G05     122.8          67.4               10.0 +/-    0.93      10.8 +/-    0.93  0.030 / 0.040
G12     187.2          56.6               10.9 +/-    2.48      12.7 +/-    2.48  0.040 / 0.050
G25     283.4          57.6               11.5 +/-    0.72      13.4 +/-    0.72  0.060 / 0.080
G29     311.8          32.4                8.8 +/-    1.19      14.6 +/-    1.19  0.050 / 0.060