You can see immediately from the display between the “Split” button and the up-arrow button that you’re working with cluster #0. The cluster numbering is pegged to the peak numbering in your reference spectrum (probably your HNCO), and the reference peak itself is displayed in the “Reference Spectrum” panel at the bottom left of the Runabout window. The up- and down- arrows enable scrolling between clusters. The “Fragments” display, in Edit Clusters mode, provides a list of all the clusters, and draws a little box around the one you’re looking at now. You can move directly to any cluster by clicking its number in the Fragments panel; try it – it’s fun! Note that the Fragments panel may be blank when you first look at it, but will work OK when you scroll up and down or click in the cluster number display and hit return. The “Peaks in Cluster” panel shows the peaks from different peak lists that are linked into this cluster; “hnca.1” is peak #1 from the hnca peak list, for example. The “Current Cluster” section provides some handy numerical data about your active cluster in the “Cluster1” section: cluster number, number of peaks in the cluster, and the HN and N frequencies. “Cluster2” refers to the peaks in the right-hand panel in the “Peaks in Cluster” panel. Right now, this is blank in our figure because we have 78 clusters, and Cluter2 is set to #79, which is empty.
