This directory contains Zygo images that are useful for calibrating the
lateral and vertical absolute scales of the microscope.  See below for
their meaning.

dir x10objective: images taken with the x10 objective lens
------------------------------------------------------------
1. Intensity images taken of a micron graticle, in various
   orientations (hor, vert) and at different zoom settings.
	graticle(0.4hor).tif
	graticle(0.4vert).tif
	graticle(1.0hor).tif
	graticle(1.0vert).tif

2. Zygo images of the top surface of a thick sample, taken
   with different scan lengths without moving the sample or
   the head height.  These are useful for determining the
   offsets in the measured z for different scan heights.
   Each directory listed below contains a coords.crd file
   containing the stage and head coordinates, and a Zygo
   file (binary format) stch1.dat containing the image.
	100normal10
	10normal10
	150normal10
	20normal10
	2normal10
	3normal10
	40normal10
	4normal10
	5normal10


dir x2.5 objective: images taken with the x2.5 objective lens
--------------------------------------------------------------
1. Zygo images of the top surface of a thick sample, taken
   with different scan lengths without moving the sample or
   the head height.  These are useful for determining the
   offsets in the measured z for different scan heights.
   Each directory listed below contains a coords.crd file
   containing the stage and head coordinates, and a Zygo
   file (binary format) stch1.dat containing the image.
	2micron
	3micron
	4micron
	5micron
	10micron
	20micron
	40micron
	100micron
	150micron

2. Same as above, but for the lower surface of a thick sample.
   Both this and the previous scans were taken with the phase
   resolution set to high-2G.
	2Lmicron
	3Lmicron
	4Lmicron
	5Lmicron
	10Lmicron
	20Lmicron
	40Lmicon
	100Lmicron
	150Lmicron

3. Same as above, but for the upper surface of the same thick
   sample.  This run is different from (1) above only in that 
   the phase resolution setting was "normal" instead of "high-2G".
   The head and stage were not moved during the collection of
   these scans.
	2normal
	3normal
	4normal
	5normal
	10normal
	20normal
	40normal
	100normal
	150normal