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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 theta1/2 (lambda) = b x lambdaa. 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.

Table 4. Fitted values of the parameters a & b of theta1/2 lambda = b x lambdaa
Spectral type r0 r-1 r-2
tau100 = 0.012 tau100 = 0.20 tau100 = 0.012 tau100 = 0.20 tau100 = 0.012 tau100 = 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