PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-19:28:00
G02     23.5           62.9               17.0 +/-    1.35      18.9 +/-    1.35  0.040 / 0.060
G05     156.2          53.5               18.5 +/-    1.31      22.4 +/-    1.31  0.040 / 0.070
G06     50.6           21.0               11.3 +/-    1.08      24.2 +/-    1.08  0.030 / 0.040
G12     210.1          74.1               18.2 +/-    1.08      18.8 +/-    1.08  0.030 / 0.030
G19     95.8           12.0               13.6 +/-    1.32      36.2 +/-    1.32  0.030 / 0.050
G20     197.3          20.8               24.3 +/-    1.01      52.4 +/-    1.01  0.030 / 0.060
G25     301.8          53.0               18.7 +/-    0.67      22.8 +/-    0.67  0.080 / 0.170
G29     303.8          25.3               16.6 +/-    1.02      32.2 +/-    1.02  0.060 / 0.170