# Hclust2 --fperc value

**URL:** <https://forum.biobakery.org/t/hclust2-fperc-value/3246>\
**Category:** MetaPhlAn\
**Created:** [March 2, 2022, 4:33am UTC](https://forum.biobakery.org/t/hclust2-fperc-value/3246 "2022-03-02T04:33:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![saras22](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@saras22](https://forum.biobakery.org/u/saras22)\
**Post date:** [March 2, 2022, 4:33am UTC](https://forum.biobakery.org/t/hclust2-fperc-value/3246/1 "2022-03-02T04:33:09Z")

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Hi @fbeghini  
I was using Hclust2.py script for making heatmaps, in the example given in github page [GitHub - SegataLab/hclust2: Hclust2 is a handy tool for plotting heat-maps with several useful options to produce high quality figures that can be used in publication.](https://github.com/SegataLab/hclust2) they have used --fperc value 99. My question is that why have they used 99? I tried using different value, I made it 100 and then --ftop n was giving different species than it was giving with --fperc 99. So, what is the logic behind this? How should I select the correct --fperc value and what is the default --fperc value?

Thanks in Advance