EZplot™ for Excel improves productivity by easily creating and updating many plots (50+) in seconds. Plots and calculations are defined with parameter names instead of cell locations. The user does not need to remember any commands because of the user interface and forms. Chart events capture changes made to charts and write them back to the EZplot sheet. The plot package script is generated automatically.

EZplot includes "Contour Plot", "Multy_Y" and many other capabilities that are not included in Excel. The Multy_Y program creates multiple Y axes plots in Excel. The Multy_Y program in EZplot  is an enhanced version that allows for interactive plotting with Multiple Y axes plots. EZplot  allows for the additional flexibility of creating these plots from the EZplot sheet.

EZplot provides formulas for 2D interpolation, 3D interpolation, and polynomials that can be used like any other Excel formula.

Excel must have access to the Visual Basic project.  Before downloading, perform the following steps in your version of Office/Excel:

Office/Excel 2007:

Microsoft Office Button -> Excel Options -> Trust Center -> Trust Center Settings -> Macro Settings -> Check Trust access to the VBA project object model

Office/Excel 2000-2003:

Tools-macro-security -> Trusted Publishers -> Check Allow access to Visual Basic Project

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Click to link to the c plot program, also called EZPlot, at the University of Washington website.
The University of Washington EZPlot program is NOT affiliated with EZplot™ for Excel or Officeexpander.com 
http://staff.washington.edu/fox/ezp/