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# Intermagnet CD Data Viewer Help

# Zooming / Scaling in Plot Windows

Scale is the range of a geomagnetic element that will be displayed in a trace window (the trace is always automatically positioned so that the mid-value of the data is at the mid-point of the trace window). Zoom is the magnfication factor applied to a trace window.

There are several different ways in which the windows that plot data can be scaled and zoomed.

## Setting the scale

Pressing the "Plot Options" button on any of the plot windows will bring up the Plot Options dialog. Amongst other things, this dialog gives you individual control over each of the traces shown in the plot window, including the scale. The Plot Options dialog also contains a control that allows you to select options for all traces at the same time.

The plot windows themselves include the same control allowing you to set the scale for all of the traces at the same time.

## Zooming a plot

If you right click your mouse on any of the trace windows, a menu will appear giving you the option to zoom in (double the magnification) or zoom out (halve the magnification).

If you drag a rectangle using the left mouse button on any of the trace windows, the plot will zoom to the rectangle you have created. If you drag a 'reverse' rectangle (where you release the mouse button to the left of the point where you pressed it), the magnification will be reset.

Selecting a new scale also clears all magnification.

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