PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-21:12:00
G02     47.4           43.4                9.4 +/-    1.05      12.9 +/-    1.05  0.030 / 0.040
G05     89.7           69.2                8.6 +/-    0.49       9.1 +/-    0.49  0.030 / 0.040
G12     184.6          44.9               10.8 +/-    1.80      14.6 +/-    1.80  0.040 / 0.080
G25     261.3          58.3                8.8 +/-    0.37      10.2 +/-    0.37  0.050 / 0.060
G29     318.7          40.9                9.3 +/-    1.25      13.3 +/-    1.25  0.060 / 0.070