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By default, OpenStudio adds the Zone Mean Air Temperature and Zone Relative Humidity output variables to a simulation IF you are applying the OpenStudio Results reporting measure. To avoid the max 255 column limit when using ReadVars to convert the ESO output file into a CSV file, you have a few options:

• Don't apply the OpenStudio Results reporting measure so that only the output variables you request are generated.
• Avoid ReadVarsESO to generate a CSV altogether and instead use an ESO file reader. This will avoid the max 255 columns limit and have better/faster plotting capabilities than Excel.