PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/15-14:13:10
G10     247.8          25.0                5.0 +/-    0.96       9.8 +/-    0.96  0.050 / 0.040
G13     56.5           31.2                3.5 +/-    1.37       5.9 +/-    1.37  0.030 / 0.040
G15     95.4           58.4                4.3 +/-    0.68       5.0 +/-    0.68  0.110 / 0.120
G16     300.5          14.9                1.1 +/-    1.82       2.8 +/-    1.82  0.130 / 0.170
G20     265.7          48.8                3.9 +/-    3.83       5.0 +/-    3.83  0.080 / 0.110
G21     334.7          60.2                2.0 +/-    0.52       2.3 +/-    0.52  0.050 / 0.080
G26     273.9          16.4                4.9 +/-    2.80      11.8 +/-    2.80  0.040 / 0.030
G29     162.2          52.1                5.4 +/-    0.69       6.7 +/-    0.69  0.040 / 0.020