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You can specify additional parameters describing the found particles. These additional parameters (particle categories or particle features) can be set in a simple dialog which can be activated from the particle editor. A particle category can be any of the following data types:
 
 
| Type | Explanation |  
| string | A string of arbitrary length. This data type is normally used to add remarks. However, by defining preset values you can use a string category as a nominal data type, as well. |  
| integer | An integer number. A typical application of integer features is the assignment of quality indicators. |  
| double | Any floating point number. This is typically used for quantitative information (e.g. concentrations). |  
| tristate | Actually the tristate type provides three predefined states (yes/no/undefined). However, Epina ImageLab uses only the values yes and no and displays the corresponding states by a (ticked) checkbox in the particle list. |  
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