An (also known as a trace file) is the standard output format for Sanger DNA sequencing, containing the raw data, base calls, and the chromatogram (the visual "peaks" of the sequence). Scientists typically download these in a compressed ZIP archive when receiving batch results from a sequencing facility. 1. How to Download Your AB1 ZIP
: FinchTV (Windows/Mac) and Chromas Lite (Windows) are popular for basic viewing and manual base-call editing. Download AB1 zip
You cannot view the raw chromatogram in a standard text editor. You need specialized software to interpret the visual peaks: An (also known as a trace file) is