PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-12:12:50
G10     296.7          51.3                4.3 +/-    0.91       5.3 +/-    0.91  0.040 / 0.030
G15     45.9           26.9                2.5 +/-    1.28       4.7 +/-    1.28  0.030 / 0.040
G20     69.1           23.2                2.3 +/-    0.95       4.7 +/-    0.95  0.060 / 0.070
G21     99.9           72.3                3.3 +/-    1.51       3.4 +/-    1.51  0.060 / 0.080
G24     98.4           26.5                5.1 +/-    1.64       9.7 +/-    1.64  0.070 / 0.140
G27     299.5          34.8                5.8 +/-    1.05       9.2 +/-    1.05  0.070 / 0.130
G32     210.6          32.7                4.7 +/-    1.78       7.8 +/-    1.78  0.040 / 0.030