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Measuring activity intensity using Whistle screenshots - Screenshots of the Whistle application display imported into Photoshop. a The grid for measurement of activity intensity is overlaying the activity bars in an incorrect position. b The grid is correctly aligned at the tip of the white ‘no activity’/white bars and at the bottom of the word ‘Intensity’. Enlargement of (c) correct and (d) incorrect alignment of the grid with the ‘no activity’ bars Activity bars
