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                7.0 +/-    0.89       7.5 +/-    0.89  0.110 / 0.260
G09     304.8          20.0                5.2 +/-    1.69      11.4 +/-    1.69  0.140 / 0.260
G14     100.2          16.9                6.3 +/-    1.67      15.0 +/-    1.67  0.050 / 0.050
G16     117.9          60.9                8.0 +/-    0.41       9.0 +/-    0.41  0.040 / 0.050
G22     188.8          50.1                8.3 +/-    0.69      10.5 +/-    0.69  0.040 / 0.030
G23     325.0          54.7                6.2 +/-    0.59       7.4 +/-    0.59  0.040 / 0.030
G26     63.4           48.8                5.9 +/-    0.86       7.5 +/-    0.86  0.040 / 0.040
G31     54.2           15.8                5.3 +/-    3.85      12.9 +/-    3.85  0.040 / 0.040