WriteDensity
Normally, hydrodynamic variables
are written at each output in the output directory (see OutputDir) with an extension that specifies
the output number. For instance, the initial surface density is written
in 'gasdens0.dat', then the
first output is written in 'gasdens1.dat',
the second one in 'gasdens2.dat', etc.
If one sets WriteDensity to
NO or FALSE, all density outputs are written to 'gasdens0.dat', which is thus
overwritten at each output. Therefore, setting this parameter to NO
does not save disk writing time, but it may be useful in case of low
disk quota, or when one is not interested in the surface density
evolution. Also, having the hydrodynamics fields of the last output
always written to a file allows to perform a restart.