PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-06:58:00
G10     254.4          29.5                7.0 +/-    2.44      12.3 +/-    2.44  0.040 / 0.040
G13     50.1           27.7                1.3 +/-    3.11       2.3 +/-    3.11  0.030 / 0.030
G15     76.7           55.7                4.9 +/-    1.08       5.8 +/-    1.08  0.130 / 0.410
G16     291.1          15.0                2.4 +/-    2.29       6.0 +/-    2.29  0.110 / 0.560
G20     2.0            69.2                3.6 +/-    0.50       3.8 +/-    0.50  0.040 / 0.040
G21     339.8          63.4                4.2 +/-    0.54       4.6 +/-    0.54  0.050 / 0.040
G26     262.6          13.8                3.7 +/-    1.63       9.5 +/-    1.63  0.110 / 0.190
G29     166.0          45.0                5.0 +/-    0.72       6.8 +/-    0.72  0.120 / 0.140