PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/31-21:27:40
G01     235.7          25.4                9.7 +/-    1.79      18.7 +/-    1.79  0.030 / 0.030
G03     307.0          59.2                8.8 +/-    1.16      10.1 +/-    1.16  0.030 / 0.030
G14     75.8           31.5                7.8 +/-    1.95      13.2 +/-    1.95  0.060 / 0.110
G16     157.9          31.7               12.5 +/-    1.20      21.2 +/-    1.20  0.060 / 0.130
G22     261.5          75.5                9.8 +/-    0.67      10.1 +/-    0.67  0.040 / 0.050
G23     298.3          29.0                8.6 +/-    1.72      15.5 +/-    1.72  0.040 / 0.050
G26     119.8          49.5               11.9 +/-    0.65      15.1 +/-    0.65  0.160 / 0.250
G31     41.1           44.1                8.1 +/-    1.23      11.0 +/-    1.23  0.130 / 0.220
G32     90.1           13.6                8.8 +/-    2.57      22.5 +/-    2.57  0.080 / 0.200