Display of a stimulus profile and the recorded activity.
The graph can be repositioned and rescaled with the mouse or by typing the desired range from the keyboard. To use the keyboard, click the mouse on the graph and then type "h" (for Help). A graph helper window should appear which allows the ranges and background grid to be set.
However, all these operations can also be performed with the mouse. Clicking with the left button zooms in, keeping the point under the mouse fixed. Clicking the right button [or the left button with the CTRL key held down] zooms out. Clicking below or to the left of the axes scales only one axis.
Click and drag actions change the range, but keep the scale fixed. Use the right button to see it move as you drag. With the left button, the change is only shown when you release the mouse.
One special case of click-and-drag is for selecting a rectangular region: click and hold at one desired corner; drag the mouse away and then back over the starting point; as it passes over the start point a square box cursor will appear that can be extended to select the desired region.
The click-and-drag operation can also be used for continuous zooming: click the desired fixed point and drag the mouse off the window. Once it is off the window, drawing clockwise circles will zoom in; anti-clockwise circles zoom out.
There is a menu at the top right with a number of other operations, each of which has a single-letter shortcut indicated by the capitalized character. Note that for these to take effect you may sometimes have to click the mouse in the window first.
Finally, the background grid can be adjusted by clicking to the right or above the data area.
For further details on the above, see the catacomb guide at http://www.compneuro.org/catacomb/userinterface.html