TYDACTypical Digital Automatic Computer
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For instance, the Integraph Network Analysis module, SPAN from TYDAC, and few others have optional modules to handle networks.
When these data existed in the form of a graph, we extracted numerical values from the figure using a Summagrid III digitizer (Summagraphics, Austin, Texas, United States) and SPANS TYDIG digitizing software (INTERA TYDAC Technologies, Nepean, Ontario, Canada).