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Roger,
Co-adding images is a technique many digital camera users to achieve two ends:
1) lower the noise in an image
2) improve the signal/dynamic range
You can combine images using many methods. Sum, average, median etc.
Many software packages will let you do this, as well as give you various ways of aligning the images....for example, you could align on the head of a comet, rather than the background stars.
Hope that helps
Peter
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