I took Herman's advice and tried Microsoft Ice--a free downloadable panorama program. It works! I put the camera atop a deck post and swiveled it horizontally. The final image is based on three originals, but it stitched without memory problems. The seams are visible, but you have to blow the photo up and really look for them. At any rate, it worked better for me than Serif PanoramaPro, and it's free.
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