date > 980101s (southern data)

	H_score = (hsig - (0.66 * 
                  ( 1.286832 + (-0.2418794*den) + (0.05129893*den*den) ) * 
                  sqrt ((hback + ((45**2) / (4.*8))) /
                  (200. + ((45.**2) / (4.*8) ))))) / 0.025



date > 981025n  (north)

	H_score = (hsig - (0.73 *
                  ( 1.286832 + (-0.2418794*den) + (0.05129893*den*den) ) *
                  sqrt ((hback + ((50.0**2) / (4.*8))) /
                  (200. + ((50.0**2) / (4.*8) ))))) / 0.025


980101n < date < 981020n (north)

	H_score = (hsig - (0.67 *
                  ( 1.286832 + (-0.2418794*den) + (0.05129893*den*den) ) *
                  sqrt ((hback + ((40.0**2) / (4.*10.))) /
                  (200. + ((40.0**2) / (4.*10.) ))))) / 0.025

date < 980101n (north)

	H_score = (hsig - (0.67 *
                  ( 1.286832 + (-0.2418794*den) + (0.05129893*den*den) ) *
                  sqrt ((hback + ((40.0**2) / (4.*10.))) /
                  (200. + ((40.0**2) / (4.*10.) ))))) / 0.025



where hsig == measured H-band noise (from galworks "hsig2"), hback is the
measure H-band background (from galworks "hback"), and den is the K-band
stellar number density (per deg^2 for star brighter than 14th mag at K).

Web page: http://spider.ipac.caltech.edu/staff/jarrett/2mass/3chan/noise/conf.html
Specific to the database:
http://spider.ipac.caltech.edu/staff/jarrett/2mass/3chan/noise/conf.html#app