Base Extractor is a mathematical algorithm that identifies the required numeric parameter of a 3D element.
Each Base Extractor calculates a separate parameter. Read how to add Base Extractors here.
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To understand which Base Extractor in particular you need:
1. Click on the Measurement Details tab at the very top of the Breakdown Table. Then you will be taken to the article with detailed descriptions for each Base Extractor.

2. Or start adding a new Base Extractor by selecting the relevant element and right-clicking on it. Then click on the i button near the name of any Base Extractor in the list and you will see its description. ⬇️