Display of overlapping mesh tallies in Moritz

We describe new features that enhance the display of mesh tallies in the Moritz geometry editing and visualization program. The use of these features is demonstrated in two-dimensional plots of the results of Monte Carlo evaluations of shielding surrounding a proton therapy treatment room. In regions where two or more mesh tallies overlap, a new method plots the value with the lowest relative error. Contour lines may be plotted over the color-coded mesh tally plots. For each contour value, the program chooses a contour color that is distinct from the underlying mesh tally. Interpolation may be used to smooth the mesh tally plot and straighten the contours. A method to extract tally values at specified locations speeds comparisons with analytic shielding calculations. Enhancements for multiple tallies include the ability to read multiple tally files, selecting visibility by particle, and changing the data type plotted for all tallies. Division of two mesh tallies may be used for comparison of runs on different computers or with different code versions. The user can restrict the minimum and maximum of the values that are plotted. The user can set a maximum/minimum ratio beyond which logarithmic scaling is used and can choose whether or not the data is plotted after reading a mesh tally file. (author)