1. Soil examination for a forensic trace evidence laboratory—Part 1: Spectroscopic techniques 
Brenda Woods, Chris Lennard, K. Paul Kirkbride, James Robertson 
Forensic Science International 
Volume 245, Pages (December 2014)
DOI: /j.forsciint
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2. Fig. 1
Map of Australia [21] with approximate locations of soil sites used in this study.
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3. Fig. 2
Microspectrophotometer (MSP) spectra for soil specimens from site 2 surface (spectrum b) and site 1 surface and sub-surface (spectra a and c respectively). Using the MSP spectra the surface soil specimen from site 2 (spectrum b) can be differentiated from the surface and sub-surface soils of site 1. The surface and sub-surface soils of site 1 cannot be differentiated using this MSP spectra alone.
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4. Fig. 3
Matrix plot of the CIE L*a*b* chromaticity coordinates for triplicate analyses of the 12 soil specimens from the Canberra area.
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5. Fig. 4
Microspectrophotometer (MSP) spectra for soil specimens from sites 11 (near Weipa, Queensland–spectrum a), 17 (near Millicent, South Australia – spectrum c) and 21 (near Alice Springs, Northern Territory – spectrum b). All these soil specimens can be differentiated using MSP.
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6. Fig. 5
Matrix plot of the CIE L*a*b* chromaticity coordinates for triplicate analyses of the CSIRO soil specimens.
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7. Fig. 6
Spectral variation observed between site 1 surface (spectrum a), site 3 surface (spectrum b) and site 4 (spectrum c) possibly due to the presence of kaolin minerals (indicated by peaks at 3700/3620cm−1).
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8. Fig. 7
Spectral variation observed between site 1 surface (spectrum a), site 3 surface (spectrum b) and site 4 (spectrum c) possibly due to the presence of quartz (indicated by peaks at 796/779/694cm−1).
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9. Fig. 8
Score plots of the first two principle components for both the original (a) and the 1st derivative spectral (b) data for the 12 Canberra area soil specimens.
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10. Fig. 9
A section of the score plot of the first two principle components for the original IR spectral data for the CSIRO soil specimens showing the grouping into 10 groups. Sites 13, 14, 16, 17 and 21 could also be differentiated from the groups illustrated, however these are not shown on the plot as they fall outside the chosen axes.
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11. Fig. 10
A section of the score plot of the first two principle components for the 1st derivative IR spectral data for the CSIRO soil specimens showing the grouping into 15 groups. Site 17 could also be differentiated from the groups illustrated, however this is not shown on the plot as it falls outside the chosen axes.
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