Dear All, I have interval data (for Mon-Sun, 00-24h) of an activity and would like to visually plot them in a matrix-like plot, where color A would be assigned to the activity, and color X to unspecified time usage. Note that the activities are not in standardised units (hours or so), but from startTime to endTime (in hrs:mins) In principle it is a bar plot where multiple bars can be stacked one on top of another, with say the x axis representing time in a day, the y axis the day of the week, without gaps between the bars? can anyone please suggest a way to plot these? Thanks Martin