PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/19-10:27:50
G10     266.6          38.7                4.4 +/-    1.03       6.5 +/-    1.03  0.040 / 0.030
G13     41.9           18.1                3.4 +/-    3.12       7.7 +/-    3.12  0.040 / 0.040
G15     59.2           48.6                5.2 +/-    0.89       6.7 +/-    0.89  0.180 / 0.210
G20     297.2          60.2                4.4 +/-    0.72       5.0 +/-    0.72  0.150 / 0.270
G21     17.6           73.0                5.6 +/-    1.07       5.8 +/-    1.07  0.100 / 0.070
G24     118.6          14.2                6.0 +/-    2.64      15.3 +/-    2.64  0.060 / 0.050
G27     319.9          16.4                4.1 +/-    2.00       9.8 +/-    2.00  0.040 / 0.030
G29     165.4          27.8                6.3 +/-    1.42      11.6 +/-    1.42  0.030 / 0.040