 
			PICK3D Program

This program is specially written for viewing big 3D scan file.
It only accept 3D scan file which must be created by the IOC scan software.

The default option assumes that the 3D scan contains MCA data arrays which 
was saved by the ScanH recored type. For non MCA type 3D scan a user should 
uncheck the "ScanH/MCA" button. 

The user first should pick the detector # desired from the detector list 
before select the 3D file from the scan file data directory. At the normal 
completion of loading a 3D scan file, the 2D slicer dialog program of the 
picked detector will pop up. Then a user can use various buttons to pick 
the axis, slicer # to access various Images, PLOT2D, ASCII, PICK1D viewing 
options on the selected detector's 3D array.

It also provide two buttons which allow the user to prepare all detector
data and slice out from all detectors for running calibration program.
They are "Generate Calib Array" and "Calib (All Di)" buttons.
User should be aware that the use of this option may generate a tremendous
disk file "3dimage.xdr" for storing the temporary 3D image array for all
defined detectors. 

The "Generate Calib Array" button generates a temporary file "3dimage.xdr
to store 3D data array for all detectors. Once the file is loaded into
PICK3D and the "3dimage.xdr" has been created successfully, a user can 
use the "Calib (All Di)" button to extract out the same slice from the
file for all detectors and run the calibration program.

Reading a typical 2.5Meg 3D data for a single detector takes around 15
seconds.  The actual time used for reading a 3D scan array depends on 
the size of 3D scan and the memeory available on the operating system. 
Reading one processed data array from the "3dimage.xdr" takes less 
than 2 seconds.

