The 3DNA coordinates are generated for the shape and dimensions specified in options for N bp base pairs and written to an archive file arcfile . The generated file is a binary format archive file. The preset value is 36 degrees.
Negative angles are legal and acceptable.
The preset action is to create a closed circular model. This may take some time. The estimate assumes a closed circular model by connecting the first and the last base pairs even when an open model is specified. Only one of the following remaining options may be specified. This is the preset shape.