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# Omicron at Virgo
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[[_TOC_]]
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## Environment
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### Local
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Omicron vXrYpZ is installed in `/virgoApp` under CL7. After being logged in an online machine (`detchar1` or `ctrl`, but not `farmn`), load the Omicron environment:
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source /virgoApp/Omicron/vXrYpZ/cmt/setup.sh
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Replace the X, Y and Z by the most recent version (highest number). You are now able to use all the omicron applications
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It is often convenient to visualize plots/pages in a web browser. A web-browsable area is available at Cascina. For Omicron, please use:
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```
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/data/procdata/web/Omicron
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```
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You can use this area to produce Omicron plots and/or web pages which you can access at the following address: https://scientists.virgo-gw.eu/DataAnalysis/Omicron/
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Please, try to keep this directory clean. You can create your own directory using your user name.
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### Conda
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Omicron is included in the [IGWN Conda Distribution environments](https://computing.docs.ligo.org/conda). After activating a recent environment, you should be able to use omicron applications. To test that you can, type:
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```
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omicron version
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```
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This should return the Omicron version number of your environment.
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## Configurations
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Omicron parameters are defined using a configuration file. This file contains a set of keywords to define the parameters. For a complete list of Omicron parameters, refer to [https://virgo.docs.ligo.org/virgoapp/Omicron/classOmicron.html#a90211e34b5d534c06bdd229524081cfc](Omicron option list).
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Examples of configuration files can be found in
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```
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/data/procdata/web/Omicron/configuration
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```
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Please, DO NOT EDIT THESE EXAMPLES! If you need to change the parameters, use a copy of the example files.
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Also, NOTE that the channel list in these examples may not be up-to-date. To update the list of channels, you can use the command:
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```
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printchannels /virgoData/ffl/raw.ffl $(( `tconvert now` - 1000 )) | awk '$2>100 {print "DATA CHANNELS", $1}'
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```
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This command prints all the channels with a sampling rate larger than 100 Hz and with the correct format for Omicron configuration files. Of course, you can filter these channels with extra bash command (e.g. `grep`).
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## Other applications
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- [Omicron conda package](https://anaconda.org/conda-forge/omicron)
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- [Python utilities and extensions for the Omicron (C++) GW event trigger generator](https://pypi.org/project/pyomicron/) |
