3D mode | Yafits

Top row : pixel-based and channel-based plot. Scales are in Jy/beam (or K)

Image on the left : channel map extracted from a channel (frequency) selected in the top-right spectrum
Spectrum on the right : spectrum of a given pixel selected in the top-left image

Bottom row : averages : area-based and frequency range-based plot.

Image on the left : map averaged from a frequency-range (velocity-range) selected in the bottom-right spectrum. The scale is in Jy/beam.km/s
Spectrum on the right : spectrum averaged over all pixels inside a box selected in the bottom-left image. The scale is in Jy.

For more informations you can also take a look at :

Define a box (clic and drag) in the central region of the Bottom-Left image, where the signal appears
Select the box (mouse click on the box) to compute the averaged spectrum on the bottom-right panel.
Select a frequency range (click and drag) in the bottom-right plot (the selected range appears in blue). This will compute and display the averaged image in the bottom-left plot.
The title of the bottom-left spectrum gives the integrated emission line inside the selected box and frequency range in Jy.km/s and the selected velocity range.

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). This will draw a marker at the position of the source. It will also select the redshift as a reference redshift to doppler shift molecular line rest frequencies.

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.

Select a box (click on the box), then type x on your keyboard. The box will be removed from the plot.

Use the central button of the mouse. Click and drag the map at the position you want.

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

Inside the images, click on the small icon with a filled circle. This will open the intensity moment map (bottom plot) into the 2D viewer. Use the same icon in order to open one channel map in the 2D viewer

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

On the top-left black menu, click on the 3 lines, this will open a menu where you can modify the color options and scaling.