Footnotes
Keywords: weeds

... PyGILDAS)1
  Weeds requires Python version 2.6 or newer.

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... database2
  The `use` command, as well as the `select` and `insert` commands that we use later on, are part of the `linedb\` language. Please type `help linedb\` for the full documentation of this language.

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... survey3
  The spectrum used in this tutorial is included in the Gildas distribution (courtesy of Emmanuel Caux), and can be copied in the current directory with the following CLASS command: `sic copy gag_demo:demo-weeds-1.30m demo-weeds-1.30m`.

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... spectrum4
  This frequency interval can be changed with the `/delta` option.

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... command5
  Alternatively, one may retrieve the predicted spectrum with `retrieve TB_MODEL`, and plot it over the observed spectrum with `spectrum`. However, it is important to fix the y-axis range; if the axis is set to `auto`, then the predicted and modeled spectrum will not be on the same scale, and the comparison will be meaningless. The `modshow` command ensures that both the observed and predicted spectra are on the same scale.

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