# Other Supported File Formats

The data structure for other file types are provided in order to understand and correctly use or post-process these files externally.

• .cgm file

In this file the number of iterations is given and the resulting residue from the iterative solving process of the matrix equation.

• .snp file

The Touchstone S-parameter file name contains the number of ports in the model. The extension is, for example, .s1p for a 1-port, .s2p for a 2-port. The file contains a header (following the “#” character) that specifies the frequency unit, the parameter type, the data format and the normalising impedance for all the ports. This is followed by the data lines (which may be repeated for multiple frequencies):

 1-port: frequency 2-port: frequency 3-port: frequency 4-port: frequency
where $|{\text{S}}_{11}|$ is the absolute value and $\angle {\text{S}}_{11}$ is the phase (in degrees) of the given parameter.
Note: The 2-port file is formatted on a single line and in a different order than for cases with more ports. This is consistent with the Touchstone file format specification version 1.0.
• .sph file

This file is using the native SWE file format of TICRA as used in their code GRASP.