PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/16-09:57:40
G02     270.6          81.4                4.2 +/-    0.71       4.3 +/-    0.71  0.130 / 0.170
G05     169.9          21.0                3.4 +/-    1.28       7.2 +/-    1.28  0.110 / 0.170
G06     38.5           58.6                4.6 +/-    0.61       5.3 +/-    0.61  0.120 / 0.110
G12     320.7          56.1                3.2 +/-    0.63       3.8 +/-    0.63  0.160 / 0.150
G17     76.4           18.1                3.9 +/-    1.86       9.0 +/-    1.86  0.040 / 0.040
G19     63.9           34.1                4.8 +/-    1.18       7.8 +/-    1.18  0.040 / 0.030
G24     240.9          31.7                3.1 +/-    0.95       5.2 +/-    0.95  0.160 / 0.320
G25     317.6          17.5                3.4 +/-    1.42       7.9 +/-    1.42  0.350 / 0.160