Change here the properties of a crystallographic or atomic plane (or list of 
planes, previously selected with Plane->Select, when 
Global is pressed).
Parameters for empty entries or 
Local choices remain unchanged.
To change the plane name write the new name in the Plane entry, followed
by the plane number (GAMGI only needs the number to identify the plane).
Reference
GAMGI can handle crystallographic planes, related with a cell containing 
the relevant crystallographic information, and atomic planes, defined by 
three non-colinear atoms.
To create crystallographic planes, set 
Reference to 
Cell.
GAMGI automatically shows a 
Cell entry, 
h, 
k, 
l     
entries to indicate the plane indices, plus a 
Vectors menu, to select 
the cell vectors to use, 
Conventional or 
Primitive. For the sake 
of simplicity, GAMGI does not accept 4-indice notation for planes or directions 
in hexagonal cells.
Pressing the mouse over a cell in the current layer, the cell identification
is automatically written in the 
Cell entry. When a valid cell is found
and its 
Type is 
Projection, the default 
Polygon page                 
is automatically replaced by a 
Projection page.
When 
Reference is set to 
Atoms, GAMGI automatically shows
three 
Atom entries. Pressing the mouse sucessively over three 
non-colinear atoms in the current layer, the three entries become occupied
and the plane defined. After pressing 
Ok, an error is shown if the 
atoms are disposed linearly.