PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-12:57:50
G03     229.1          66.5                6.9 +/-    0.81       7.4 +/-    0.81  0.160 / 0.410
G09     304.8          20.0                7.3 +/-    1.81      16.0 +/-    1.81  0.200 / 0.470
G14     100.2          16.9                7.1 +/-    1.73      16.9 +/-    1.73  0.040 / 0.060
G16     117.9          60.9                9.9 +/-    0.78      11.2 +/-    0.78  0.050 / 0.070
G22     188.8          50.1                8.2 +/-    1.71      10.3 +/-    1.71  0.040 / 0.040
G23     325.0          54.7                6.5 +/-    0.50       7.7 +/-    0.50  0.030 / 0.050
G26     63.4           48.8                6.5 +/-    0.62       8.3 +/-    0.62  0.040 / 0.060
G31     54.2           15.8                6.6 +/-    2.28      16.2 +/-    2.28  0.030 / 0.050