Represents the "T" entry of the rectilinear measure dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains an array which contains NumberFormatElements.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 262, page 481.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 267, page 594.

The slope (tangent) format array specifies how the ratio of a vertical to a horizontal distance is expressed for slope or grade calculations.