PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-15:27:50
G10     260.6          33.5                4.0 +/-    1.95       6.6 +/-    1.95  0.140 / 0.370
G13     45.8           23.9                3.7 +/-    1.26       7.4 +/-    1.26  0.150 / 0.400
G15     65.4           51.6                6.2 +/-    0.48       7.7 +/-    0.48  0.050 / 0.040
G16     288.9          12.8                3.6 +/-    1.55       9.4 +/-    1.55  0.050 / 0.040
G18     291.5          63.4                4.6 +/-    1.05       5.1 +/-    1.05  0.060 / 0.070
G20     48.5           42.3                4.6 +/-    0.54       6.4 +/-    0.54  0.050 / 0.090
G21     3.4            70.6                3.5 +/-    0.92       3.7 +/-    0.92  0.110 / 0.430
G26     260.1          10.7                3.7 +/-    1.86      10.1 +/-    1.86  0.120 / 0.470
G27     320.4          15.1                4.1 +/-    2.24      10.2 +/-    2.24  0.140 / 0.370
G29     165.4          33.8                7.2 +/-    1.51      11.7 +/-    1.51  0.160 / 0.470