[Gretl-users] strange histogram behavior

Dear list(eners), I'm not sure (yet), but there might be a bug in the histogram calculation and / or display in gretl 1.5.1. (This is on a German windows xp.) If you have the time, look at variable "Dax" (students' forecast of a German share index) in the attached datafile: the supposed histogram looks more like a mixture of a real histogram (displaying empirical density for some chosen bins) and a bar graph (displaying relative frequency of values). Or is my observation due to some inadvertent user setting? Also, it seems to me that when I used that data last semester (with gretl 1.4 or 1.5.0), this didn't happen (although I don't remember exactly and could be wrong). Thanks for clarification, Sven