Useful 2D-background models

2D-models useful to describe non-factorazable (f(x,y)!=f(x)*f(y)) background:

• PolyPos2D_pdf : positive (non-negative) polynomial in 2D
• PolyPos2Dsym_pdf : positive (non-negative) symmetric polynomial in 2D
• PSPol2D_pdf : product of phase spaces functions, modulated with 2D polynomial
• PSPol2Dsym_pdf : symmetric product of phase spaces, modulated with 2D polynomial
• ExpoPSPol2D_pdf : sxponential times phase space times positive 2D-polynomial
• ExpoPol2D_pdf : product of exponents times positive 2D-polynomial
• ExpoPol2Dsym_pdf : symmetric version of above
• Spline2D_pdf : 2D-generic positive (non-negative) spline
• Spline2Dsym_pdf : 2D symmetric positive (non-negative) spline