The CrtLine record specifies the presence of drop lines, high-low lines, series lines or leader lines on the chart group. This record is followed by a LineFormat record which specifies the format of the lines.
id (2 bytes): An unsigned integer that specifies the type of line that is present on the chart group. This field value MUST be unique among the other id field values in CrtLine records in the current chart group. This field MUST be greater than the id field values in preceding CrtLine records in the current chart group. MUST be a value from the following table:
Type of Line
Drop lines below the data points of line, area, and stock chart groups.
High-low lines around the data points of line and stock chart groups.
Leader lines with non-default formatting connecting data labels to the data point of pie and pie of pie chart groups.