Assumptions on LF shape

• Density φ(LX, z, NH)
• Shift in field to verify if
• assumed double-PL evolution is simple
• or complex (LDDE)
• Miyaji+15 split sample, check LF in bins
• Aird+10,+15 bending PL of obsc, unobsc evolution via polynomials
• Buchner+15 smooth fields fewest assumptions, large uncertainties