Symmetry properties and widths of the filamentary structures in the
  Orion A giant molecular cloud
  We identify 225 filaments from an H$_2$ column density map constructed using
simultaneous $^{12}$CO, $^{13}$CO, and C$^{18}$O (J=1-0) observations carried
out as a part of the MWISP project. We select 46 long filaments with lengths
above 1.2 pc to analyze the filament column density profiles. We divide the
selected filaments into 397 segments and calculate the column density profiles
for each segment. The symmetries of the profiles are investigated. The
proportion of intrinsically asymmetrical segments is 65.3$\%$, and that of
intrinsically symmetrical ones is 21.4$\%$. The typical full width at half
maximum (FWHM) of the intrinsically symmetrical filament segments is $\sim$
0.67 pc with the Plummer-like fitting, and $\sim$ 0.50 pc with the Gaussian
fitting, respectively. The median FWHM widths derived from the second-moment
method for intrinsically symmetrical and asymmetrical profiles are $\sim$ 0.44
and 0.46 pc, respectively. Close association exists between the filamentary
structures and the YSOs in the region.
