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This is a line graph. The title reads ‘Graph to show monthly heating bills before and after insulation.’ The horizontal axis is labelled as Time/month and the vertical axis is labelled as Monthly heating bill/£. No scales are marked. The line graph appears to show fairly high costs initially but these fall quite rapidly. Just before the line graph starts to fall steeply, a vertical dotted line is marked and at the intersection point with the horizontal axis, a note says ‘Insulation installed.’