PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-09:27:50
G10     245.1          22.8                5.8 +/-    2.03      11.8 +/-    2.03  0.040 / 0.040
G13     59.8           32.6                4.3 +/-    1.37       7.1 +/-    1.37  0.050 / 0.040
G15     99.0           57.5                6.2 +/-    1.67       7.2 +/-    1.67  0.090 / 0.280
G16     306.6          13.3                1.4 +/-    1.83       3.7 +/-    1.83  0.080 / 0.310
G20     261.8          46.6                6.6 +/-    4.26       8.7 +/-    4.26  0.060 / 0.120
G21     332.6          59.0                4.4 +/-    0.46       5.0 +/-    0.46  0.060 / 0.120
G26     280.1          16.8                5.8 +/-    1.25      13.9 +/-    1.25  0.090 / 0.150
G29     159.1          53.0                7.9 +/-    0.70       9.7 +/-    0.70  0.080 / 0.090