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In sherpa-samp, we extend astLib's astSED class for its implementation of redshifting SEDs [REFERENCE].   From the user's perspective, he/she supplies the initial and final redshift of the SED and clicks "Create New SED." The returned SED has the same name of the unshifted SED, appended with _redshift. For example, if the final redshift is \textit{z}\(=0.0\) \(z=0.0\)  the shifted SED is named "Sed\_0.0." \subsubsection{Interpolation}  Iris provides 1D interpolation along the spectral axis. There are three interpolation options: linear, linear spline, and nearest neighbor. Interpolation may be carried out on a linear or logarithmic scale. Users may choose the number of bins, the spectral range overwhich to interpolate, and may choose to smooth the resultant SED via a boxcar method.