PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-21:42:50
G01     61.2           30.9               10.9 +/-    0.65      18.8 +/-    0.65  0.090 / 0.230
G07     141.9          23.6               12.4 +/-    2.06      24.9 +/-    2.06  0.110 / 0.340
G11     49.4           25.8                8.8 +/-    1.71      17.0 +/-    1.71  0.120 / 0.270
G13     264.1          35.5               13.3 +/-    1.89      21.0 +/-    1.89  0.130 / 0.270
G15     294.7          16.4                9.8 +/-    1.47      23.5 +/-    1.47  0.050 / 0.080
G17     248.4          71.2               11.4 +/-    0.72      11.9 +/-    0.72  0.050 / 0.070
G18     43.3           13.9                8.4 +/-    2.22      21.5 +/-    2.22  0.110 / 0.150
G19     231.6          49.0               12.4 +/-    2.30      15.8 +/-    2.30  0.090 / 0.110
G28     34.9           56.8               12.5 +/-    0.70      14.6 +/-    0.70  0.040 / 0.050
G30     142.7          51.5               11.3 +/-    0.30      14.0 +/-    0.30  0.040 / 0.050