The DropBar record specifies the attributes of the up bars or the down bars between multiple series of a line chart group and specifies the beginning of a collection of records as defined by the Chart Sheet Substream ABNF. The first of these collections in the line chart group specifies the attributes of the up bars. The second specifies the attributes of the down bars. If this record exists, then the chart group type MUST be line and the field cSer in the record SeriesList MUST be greater than 1.
pcGap (2 bytes): A signed integer that specifies the width of the gap between the up bars or the down bars. MUST be a value between 0 and 500. The width of the gap in SPRCs can be calculated by the following formula:
Width of the gap in SPRCs = 1 + pcGap