... Near Infrared Camera and Multi-Object Spectrometer Instrument Handbook for Cycle 17 > Appendix D: Techniques for Dithering, Background Measurement andMapping . ... Techniques for Dithering, Background Measurement and . ... D.3 Chop and Dither Patterns . D.3.1 Dither Patterns . ... NICMOS patterns have been created to enable observers to perform dithering, chopping, and mapping, and these patterns are significantly different than those described in earlier versions of this handbook. ...