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We strongly recommend conducting an optimization test in order to to improve the data collection quality and future model performance.
In order to reduce the variance, we would recommend the following:
1. Consistent experimental set up: using identical distance from the sample during the scanning process, constant temperature and ambient light.
2. Grinding or chopping the samples in order to increase homogeneity.
3. Pressure: the suggestion to put pressure on the sample may be effective, but glass will cause specular reflection. You can try to press the sample and then release.
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The Consumer Physics Team