+\usage
+\begin{twocollist}
+\twocolitemruled{{\bf Parameter}}{{\bf Options}}
+\twocolitem{{\bf --filter}}
+{Selects which filter to apply to each projection. To properly reconstruct an image, this filter should be multiplied
+by the absolute value of distance from zero frequency.
+\begin{itemize}\itemsep=0pt
+\item abs\_bandlimit
+\item abs\_cosine
+\item abs\_hamming
+\end{itemize}
+}
+\twocolitem{{\bf --filter-parameter}}{Sets the alpha level for Hamming
+ window. At setting of 0.54, this equals the Hanning window.}