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Sample of Targets.txt file for limma package
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SlideNumber     FileName        Cy3     Cy5     Date
81      swirl.1.spot    swirl   wild type       2001/9/20
82      swirl.2.spot    wild type       swirl   2001/9/20
93      swirl.3.spot    swirl   wild type       2001/11/8
94      swirl.4.spot    wild type       swirl   2001/11/8
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Comments:
	- Columns 'SlideNumber' and 'Date' are optional.
	- A 'Name' column can be added to associate plot lables with arrays.
	- ImaGene stores channel data in separate files. See manual for special 
	  format of Targets.txt file.