User manual

the operations and simultaneously, the mouse pointer will move alone displaying the
corresponding actions.
5.1.1 The stack
The stack represents all the data loaded in memory and which can be displayed in a
view. The stack is structured as a set of "planes" stacked one above another. The user -
symbolized by the eye – observes the stack from the top.
Types of plane
The planes may be of different types depending on the nature
of the data they contain. They are marked by specific logos,
easily identifiable:
The stack and its associated views
In the most simple case, the stack would contain only one
image, and be overlaid with a number of catalogue planes. A
complete view of the stack can be obtained in this case with all
the catalogues shown overlaid on the image.
There are two methods for creating views:
 Click and drag the plane from the stack into a view window
 Or, simply activate the plane
Activation of a plane is done by clicking the square tick-box of the plane in the stack or
on the plane logo itself. When active the plane logo appears shaded in grey
In brief, the activation of a plane automatically creates a view with all the graphic planes
that may be projected onto it. De-activating a plane will however only hide the view from
the current view windows.
If there are several planes simultaneously
activated, the plane used for the
astrometrical view projection has a red tick-
box, the other planes appears with a black
tick-box.
Tip : It is possible to create a view using
only a catalogue plane without being
overlaid on an image behind. Create the
view by clicking and dragging the catalogue
plane into a view window.
Image planes of the same field may be
compared in various ways. One image may
be overlaid on another with a controlled
level of transparency (see 7.1). Alternatively
13