Origin Version 5.0 Operating System: XP I'm importing data into a 800x800 matrix format with values ranging from [-7,1] and plotting colour/bw contour plots. However Origin is colouring some regions incorrectly. i.e. it is colouring small negative values ~-10^-5 (eg in a countour from [-1,0])as if they were positive(a countour from [0,1]). Is there any way around this? I've tried upping the number of sig. digits in the 'contour details' dialogue box, but it makes no difference. Thanks in advance. Mark