\figname{\BSbasis}
\midinsert
\vbox{
\centerline{\psfig{file=figures/BSbasis.p,width=\hsize}}
\figurecaption{\BSbasis}{The six $B$-spline basis functions for representing the fits in Fig.~\BS(d). The two interior knots are indicated by the vertical broken lines.
The points indicate the occurrence of data, and are $\{x_i,B_j(x_i)\}$ for $j=1,\ldots,6$.
}*
}
\endinsert