## Rotating and Scaling Plots

At times, all that is available are old distorted photo copies of plots. xyscan assumes perfectly aligned plots (i.e., not tilted w.r.t. the vertical or horizontal). Scanning tilted plots would require precisely aligned markers in x and y for each point making the scanning of perfectly aligned plots (99% of all cases) more cumbersome. Instead xyscan allows to rotate a plot once it is loaded before setting the markers. To do so, use the spin box (circled red below) in the Plot Info and Adjustment tab in the Tool Box. Units displayed are in degrees. Use the cross-hair to check for horizontal and/or vertical alignment. For increased precision launch the Cursor Zoom window. The plot rotates around its center. Rotating a plot is disabled once a marker is set.

Note that xyscan cannot handle distorted plots of any kind other than tilts. It is strongly recommended to correct distortions beforehand using one of the many graphics manipulation programs on the market.

For convenience you can also scale (zoom in/out) the plot using the right spin box (circled blue above). Note, that zooming in will typically not increase the precision of the scan although it eases setting the markers precisely. Here the Zoom Window comes in handy.