**3.2. Spatial / Structural Information**

With the motive of assessing the diagnostic power
of the spatial / structural information,
the half width at half maxima (HWHM)
sizes for some of our models are computed for the selected ISOCAM
SW and LW filters (Table 5 of Paper I).
The choice of the filters have been made in such a way that the true
continuum is sampled and the spectral features (say due to
Polycyclic Aromatic Hydrocarbon, PAH, etc.) are avoided.
In a manner similar to Paper I,
the wavelength dependence of these HWHM sizes have been fitted by a power
law of the form _{1/2}
() = *b* x
^{a}. The best
fit values of `*a*' and `*b*' are listed in
Table 4 for the
selected models.
The usefulness of the values of `*a*' & `*b*' are discussed in
section 4.5.

Spectral type | r^{0}
| r^{-1}
| r^{-2}
| |||

_{100} = 0.012
| _{100} = 0.20
| _{100} = 0.012
| _{100} = 0.20
| _{100} = 0.012
| _{100} = 0.20
| |

O4 | a = 0.56 b=15.96 | a = 0.31 b=16.01 | a = 0.14 b=15.92 | a = 0.34 b=15.74 | a = 0.15 b=15.83 | a = 0.41 b=15.66 |

O7 | a = 0.65 b = 15.28 | a = 0.46 b = 15.41 | a = 0.19 b = 15.31 | a = 0.34 b = 15.14 | a = 0.15 b = 15.24 | a = 0.43 b = 15.06 |

B0.5 | a = 1.02 b = 14.24 | a = 0.62 b = 14.77 | a = 0.14 b = 14.82 | a = 0.33 b = 14.61 | a = 0.14 b = 14.70 | a = 0.40 b = 14.55 |