All Figures

	Figure 1: The independent up and down scans of band 4 of the ISO-SWS spectrum of HD 100453. We have also added part of band 3 (the region between 23 and 27.6 m, averaged between both scans) to show the continuum around the feature.
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In the text

	Figure 2: The groundbased spectrum of the 10 m regions (grey line), compared with the ISO-SWS spectrum (black line).
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In the text

Figure 3: Upper panel: fits to the spectra of HD 100453 for different scans. The observed spectra use the SWS spectrum except for the 10 micron region where the ground-based spectrum has been inserted. The 3 different spectra differ in which scan(s) hase been used in the SWS band 4. The vertical lines indicate the positions of important forsterite emission features. The full lines are the best fit to the spectra using a size distribution. Dotted lines indicate best fits using only small grains. The model parameters are listed in Table 1. Lower panel: absorption coefficients for crystalline forsterite grains with radius 0.1 m, 1.5 m and 3 m, respectively. Note that all features except the 34 m feature are dramatically reduced when the grains reach a radius of 3 m.

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In the text