PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-14:57:50
G03     220.9          64.3                8.9 +/-    1.29       9.8 +/-    1.29  0.160 / 0.250
G09     306.0          21.2                6.6 +/-    2.14      14.1 +/-    2.14  0.110 / 0.320
G14     102.5          14.5                7.5 +/-    1.34      18.8 +/-    1.34  0.040 / 0.070
G16     113.6          62.2                9.8 +/-    0.41      11.0 +/-    0.41  0.060 / 0.070
G22     186.4          46.5               10.9 +/-    2.20      14.4 +/-    2.20  0.050 / 0.040
G23     327.8          57.1                7.2 +/-    0.75       8.4 +/-    0.75  0.050 / 0.050
G26     60.6           47.5                6.8 +/-    0.67       8.8 +/-    0.67  0.040 / 0.060
G31     55.4           14.3                5.5 +/-    2.70      13.8 +/-    2.70  0.040 / 0.060