PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/28-11:43:10
G10     296.5          51.3                3.5 +/-    2.51       4.4 +/-    2.51  0.080 / 0.070
G15     45.9           27.0                2.4 +/-    1.97       4.4 +/-    1.97  0.090 / 0.100
G20     68.9           23.7                3.9 +/-    2.82       7.9 +/-    2.82  0.050 / 0.130
G21     99.0           72.7                3.7 +/-    0.66       3.9 +/-    0.66  0.080 / 0.120
G24     98.5           26.4                4.8 +/-    1.13       9.1 +/-    1.13  0.040 / 0.040
G27     299.7          34.7                4.9 +/-    2.20       7.9 +/-    2.20  0.050 / 0.040
G32     210.5          32.6                5.0 +/-    1.45       8.2 +/-    1.45  0.080 / 0.070