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In field electron emission (FE) studies, to interpret current-voltage dataand extract characterization parameters, we use smooth planar metal-likeemitter (SPME) methodology and a data-analysis plot. Three types exist:Millikan-Lauritsen (ML), Fowler-Nordheim (FN) and Murphy-Good (MG) plots. InSPME methodology, ML and FN plots are slightly curved but a MG plot is nearlystraight. 1956 MG FE theory is better physics than 1928 FN theory, so we expectMG plots to be more precise than ML or FN plots. Current-voltage data are oftenconverted: measured voltage to (apparent) macroscopic field, current tomacroscopic current density. Thus, four different data-input forms exist.Over-simplified models of system behaviour are widely assumed. Whether simpleuse of a data-analysis plot is a valid interpretation method is oftenneglected. Published FE studies seem to contain a high incidence of spuriousvalues for "field enhancement factor". A procedure (the "Orthodoxy Test")described in 2013 allows a validity check: around 40 % of a small sample ofresults were spuriously high. To assist data interpretation and validitychecks, a simple user-friendly webtool has been designed by the lead author. Asinputs, this needs system specification data and "range-limits" data from anyof the three plot forms, using any of the four data-input forms. The webtoolthen applies the Orthodoxy Test, and -- if passed -- extracts characterizationparameters. This study reports: (1) systematic tests of webtool functionality,using simulated input data prepared using Extended MG FE theory; and (2)systematic comparisons of the three different data-plot types, to check howwell extracted parameter values match simulation input values. A summary reviewof relevant theory is given. For formal emission areas, the MG plot performsbetter than FN and ML plots. This is important for FE science.

Interpretation of field emission current-voltage data: background theory and detailed simulation testing of a user-friendly webtool