User manual

Thus, for loading Simbad data, you have to click on the Simbad tab, and without

changing the parameter value in the form fields (identical to the previous position),

press the “SEARCH” button again. Notice that for a catalogue, you have to write its name

in the VizieR form before submitting the request. In our example, as NOMAD is a large

survey, you can directly select it in the “Surveys” tab by clicking on the corresponding

line. After that, you must press the "SUBMIT" button.

Data visualization (4)

There are 4 components to the data

visualization window:

1. The stack: shows all the downloaded

data as a stack of “planes”. The user

eye is on the top of this stack and sees

all activated planes by transparency.

2. The zoom: shows the image area

currently visible (blue rectangle)

according to the factor and the centre

of the zoom.

3. The view: displays the image area

currently visible according to the

activated stack planes, zoom factor

and the overlaid graphics and table

planes.

4. The measurements: shows the

measurements associated to the objects selected in the view via the mouse

(magnitude, parallax…)

Plane activation: Enabling or disabling a plane is done by clicking on the small

checkbox on the left of the plane logo in the stack. It is also possible to arrange planes

within the stack via the mouse (click and drag) (note that an image on top of the stack

hides catalogues below).

zooming by using the mouse wheel. The view will be automatically centred on this

object.