PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-07:28:00
G10     260.2          33.6                4.3 +/-    1.14       6.9 +/-    1.14  0.110 / 0.460
G13     45.7           23.6                3.8 +/-    2.90       7.7 +/-    2.90  0.120 / 0.380
G15     66.7           52.5                4.5 +/-    0.84       5.6 +/-    0.84  0.130 / 0.100
G16     285.1          13.9                3.3 +/-    1.34       8.5 +/-    1.34  0.160 / 0.170
G20     19.8           64.0                4.0 +/-    1.17       4.4 +/-    1.17  0.190 / 0.310
G21     349.7          67.7                4.3 +/-    0.75       4.7 +/-    0.75  0.190 / 0.170
G24     125.8          10.3               -6.8 +/-   25.31     -18.7 +/-   25.31  0.060 / 0.040
G26     257.3          10.9                3.7 +/-    2.69      10.2 +/-    2.69  0.060 / 0.040
G27     320.9          14.2                1.2 +/-    1.75       3.0 +/-    1.75  0.050 / 0.030
G29     167.1          38.2                5.1 +/-    1.10       7.7 +/-    1.10  0.050 / 0.040