Excel 2007 Data Bar Vs Excel 2010 Data Bar. Data Bars in Excel 2007 had their base at the left edge of the cell, and extended to the right. If a cell had a zero value, it still had a small length of bar, giving the wrong impression that the cell really did contain some value.
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A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45-degree angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles.