Indicate here the number of atom copies to create and its destination.
Number
This is the requested number of copies, which is 
necessarily an integer, not smaller than 1 (the default).
Layer
Gamgi expects users to identify first the atom or list of atoms to copy.
When the 
Atom entry is active and empty, clicking the mouse over
an atom, on the current layer (local selection), its identification is
transported to the 
Atom entry.
Gamgi is now expecting users to identify a layer to where the atoms 
should be copied. Pressing the mouse over the graphic area in any window 
(global selection), creates a menu with all the layers in that window, 
which can then be selected. Initially, the identification of the current 
layer is entered in the 
Layer entry.