PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/13-06:57:50
G10     245.2          21.7                7.1 +/-    2.88      15.0 +/-    2.88  0.080 / 0.310
G13     60.5           33.5                4.7 +/-    0.62       7.7 +/-    0.62  0.080 / 0.300
G15     98.5           57.3                5.9 +/-    0.67       6.9 +/-    0.67  0.040 / 0.050
G16     302.1          15.3                0.9 +/-    0.88       2.2 +/-    0.88  0.040 / 0.040
G20     341.3          73.7                4.4 +/-    0.35       4.5 +/-    0.35  0.040 / 0.040
G21     326.4          55.9                3.9 +/-    0.50       4.6 +/-    0.50  0.030 / 0.040
G26     273.2          18.0                5.2 +/-    1.23      11.9 +/-    1.23  0.030 / 0.040
G29     162.8          57.4                6.1 +/-    0.29       7.1 +/-    0.29  0.030 / 0.040