270e2736_up__University_of_Victoria__BC__Description
[Action] Zoom In (Zoom Mode) Zoom Out (Zoom Mode) [Default Shortcuts] =, + -,_ [Description] 
Zooms the main view in or out a fixed amount. The zooming is relative to where the mouse is located. The amount of zooming depends on how long the keyboard or mouse button is pressed.
Shrimp User Manual | The CHISEL Group, University of Victoria, BC
Description