These amounts ore proportionote to the height of the columns This means Ihot the zero line, when it is ifie prir>cipot hne of reference, should olwoys be iTKluded in a column chort. It follows, too, that the omouni scoles should no* be broken, but mode continuous from the reference Ime. While normoffy the full length of the column should be shown, when it represents on abr<ormally lorge value the column may be broken at the lop ond ttie omount irKitcoted.

Columns should be spoced occording to their proper position on the time scale. SVhen time intervals between volues are not equal, columns should be spoced occordingfy.

4. SCALE DESIGNATIONS Ptocmg of scole numerals ond captions on coKimn chorts is less conventior^olized than on line charts. As the grid rulings ore ohen irKomplete, the verticol scole volues generally are ploced on the s*de where tfie rulif^gs ore complete (For exomple, if the tollesi columns ore at the right, the scole designations moy be shown on the righihond SKie only |

Tifite Scale Desigrxitions are nornHslly centered ur>der tf>e columns, reodtng fiorizontally . in column chorts for popular presentotion fttfier or both omount and time designations may be ploced obove the columns

& COLUMNS The eAeclive appeoronce of o column chart requires ipecol core m the design of the columns When there are only a lew cohrmrts H<ev should be norrower thon tl<e white spoce between, when there ore mony cohniuu the reverse should be trve

COLUMN DESIGNATIONS It is generally more difTKult to lobcl segmented or grouped columns than curves because tfie columns themselves take up so much more of the spoce Segment labels should be placed ocross several columns il procticobte However, the space about labels should be reduced as much as possible and too much controst with the tone of the column ovoided so os not to distort the impression of the relative lengths of the columns ond segments Where labels cannot be placed on the columns, orrows may be used A key or legend should be used only when improcticoble to lobel directly.