PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-12:58:00
G07     30.6           69.4                7.5 +/-   36.79       7.9 +/-   36.79  0.040 / 0.050
G08     56.4           44.3                6.7 +/-   32.43       9.2 +/-   32.43  0.040 / 0.040
G09     177.5          42.2                8.4 +/-   35.91      11.9 +/-   35.91  0.030 / 0.030
G11     124.8          31.1                7.8 +/-   35.90      13.4 +/-   35.90  0.030 / 0.030
G18     109.9          13.0                7.2 +/-   34.86      18.7 +/-   34.86  0.130 / 0.270
G23     160.2          13.5                5.2 +/-   37.97      13.4 +/-   37.97  0.180 / 0.280
G27     38.7           13.1                5.5 +/-   34.78      14.2 +/-   34.78  0.080 / 0.250
G28     265.6          48.7                5.6 +/-   36.69       7.1 +/-   36.69  0.100 / 0.240
G30     324.4          54.0                6.9 +/-   34.79       8.4 +/-   34.79  0.170 / 0.320