The recognition of the nebula was defined in case the FWHM value of the
object exceeded that of the stars by 1 sigma 
in at least one
direction. This happened with 
, H 2-2 and
beside the standard nebulae Hb 6 and IC 4997. The
following further objects have larger FWHM values compared with those of
the stars in the vicinity, being close to 
: MWC 560, MWC 574, LS
and HR Del. The existence of small nebulae at these
objects is therefore possible.
For the calculation of the nebular diameter the simple relation
was used. The results are given in Table 3 (click here) for reliable and
possible nebulae. We summarized the diameters in x and y direction,
respectively, together with the mean errors, for which N - number of
frames (see Table 2 (click here)) - was used.
