It is often useful when reducing `difficult' data, to be able to examine various intermediate `spectra' generated during the reduction process. ECHOMOP provides a very flexible method of examining any intermediate arrays produced by it or other tasks. The ech_plot task/ECHMENU Option 27 provides zooming, re-binning, re-scaling etc. on any array in the reduction database. Arrays may be specified by name or by using a set of reference names by which ECHOMOP tasks access them. To obtain a directory of known reference names use the D(irectory) option in ech_plot.