IPAC 		 		INTEROFFICE MEMORANDUM

		 		701--95--rmc2

		 		Feb. 6, 1995

 TO: 		2MASS Team

 FROM: 		R. Cutri

 SUBJECT: 		Flat Fielding Issues

• Objectives of Flat-Fielding
• Deficiencies With "Dark-Sky" Flats
• Alternative Flat-Fielding Strategies
  • Dark-Sky + "Correction Map"
  • Internal Illuminator + "Correction Map"
  • Twilight-Sky
  • Dome Flats
  • Integrated Source Flats
  • Conclusions
• References