OGIP Calibration Database DATA area

For convenience, the directory tree under this area are arranged using 
the following directory naming convention:
  	{mission}/{instrument}/{type} 
where {mission} 	is the name of the satellite
      {instrument} 	is the name of the instrument/detector on that satellite
      {type} 		is either:
		bcf - for "Basic Calibration Files"
		cpf - for "Calibration Product Files"

Basic Calibration Files contain basic calibration information such as 
	the effective area, energy resolution, point-spread function 
	of the instrument. In many ways these datasets can be thought of 
	as the 'atomic' units of calibration.

Calibration Product Files contain 'higher' level calibration products
	(which can usually be generated using BCF datasets) suitable 
	for specific data analysis tasks. Examples include exposure maps,
	response matrices etc