1 Description
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	Determination of panel screw settings for Plateau de Bure antennas,
	using holography.
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	The resulting files of screw motions will be named "panels-ani.dat"

Additional input parameters:
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2 HPMODE	
"Modes "
	Specify the authorised panel motions, to be commanded by the screw 
	settings. Five modes  are allowed, since there are five screws 
	on each panel (except 3 for ring 1). Available options are:

	Piston		TRANSLATION of the whole panel, in the normal 
			direction (1 mode).
	+Tilt		Add the panel ROTATION, along axes tangential to the
			of the antenna surface (1+2 modes).
	+Torsion 	The same, plus panel TORSION: opposite panel corners
			move in the same direction, while adjacent panel 
			corners move in opposite directions; the center
			does'nt move (3+1 modes)
	+Boss		The same, plus the panel DEFORMATION where the panel
			center moves relative to its corners (4+1 modes).

2 HNITER
"Num. Iterations ?" 
	Number of iterations when solving for panel modes. 
	The iterative procedure is used to allow for the finite resolution 
	of the surface measurement, which is not negligible as compared to 
	the panel size.
	At each iteration the effect of panel displacements are subtracted
	from the observed beam map, the residual beam map is used to compute 
	a residual surface map, which is used to compute improved panel 
	displacements. The default is 5 iterations, which is normally 
	enough for a good convergence. At each iteration, both the surface map
	and the map of panel displacements are plotted.

2 HGAIN
"Interative Gain ?"
	The gain of each iteration: this allows to subtract only a fraction of 
	the panel displacements from the observed beam map, to improve 
	convergence. This is not normally needed, so the default is 1.

2 HRINGS
"Rings avoided for paraboloid fit ?" 
	This string should contain the panel rings (numbered 1 to 6 
	from center to edge of the antenna surface, separated by spaces), 
	which should be left out when fitting the reference paraboloid 
	to the computed surface map. 

	This allows to use only the "good" part of the surface to fit 
	the paraboloid, using it as a reference for the rest of the surface
	(i.e. the "bad" part, the deformations of which one aims to correct).
2 HSECTS
"Sectors avoided for paraboloid fit ?"
	This string should contain the panel sectors (numbered 1 to 16 
	clockwise from 09:00 hours on the plotted map, separated by spaces), 
	which should be left out when fitting the reference paraboloid 
	to the computed surface map. 

	This allows to use only the "good" part of the surface to fit 
	the paraboloid, using it as a reference for the rest of the surface
	(i.e. the "bad" part, the deformations of which one aims to correct).
1 END