PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-12:12:40
G10     291.5          49.5                3.6 +/-    3.32       4.6 +/-    3.32  0.060 / 0.070
G15     46.6           30.1                3.0 +/-    0.81       5.2 +/-    0.81  0.060 / 0.090
G20     66.4           25.6                2.9 +/-    2.51       5.7 +/-    2.51  0.090 / 0.130
G21     88.4           74.3                4.7 +/-    0.36       4.9 +/-    0.36  0.070 / 0.140
G24     102.3          25.0                5.9 +/-    1.17      11.6 +/-    1.17  0.040 / 0.030
G27     303.4          33.1                2.2 +/-    1.82       3.6 +/-    1.82  0.040 / 0.030
G32     209.1          29.0                5.5 +/-    1.91       9.8 +/-    1.91  0.120 / 0.110