1D mode | Yafits

Main display : Display of 1D spectrum, frequency is in GHz.For more informations you can also take a look at :

Click on Search : this will resolve the source coordinates in NED and list the possible sources in the FoV.
In order to select a source, click on one line of the Table in the pop-up window (click on the line, not on the link : the link is to go to NED). It will select the redshift as a reference redshift to doppler shift molecular line rest frequencies. The redshift can also be set manually.

Once the redshift has been selected (see above) : click on Show Lines after selection
Select a frequency range (blue area) to search for theoretical redshifted frequency in the selected range. Vertical lines in orange display the expected transition frequencies
Use the filters to change molecular catalogues, apply filters (Intensity, Energy, number of atoms…)
The list of molecular transitions found is listed in the table on the right. Use the > and >> button to see all the possible lines.
Select one line inside this Table (click on one specie on the left hand side list of species) to compute the Line Luminosity (displayed at the top of the Table).

specify a given species (ie CO) in the search field under the « Show line after selection » checkbox
Click on the Dataset button that appeared. It lists all the transitions of this given species.
A list of transitions is displayed. A small arrow appears in front of the line if the transition is in the datacube.

Click on Save to download the 1D spectrum in FITS format
On you local computer, open CLASS (ie https://www.iram.fr/IRAMFR/GILDAS/gildasli2.html
CLASS > fits read averageSpectrumXXXX.fits
CLASS > plot

Choose the number of channels you want to smooth (form on the right hand side) and click either on the View button to open a new 3D viewer with the smoothed data cube or click on Download to retrieve the new cube