Represents the "Order" entry of the type 0 function dictionary object.

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

It contains an integer representing a PDF numeric object.

It should have a minimum value of 1 and a maximum of 3.

The PDF specification states that this item assumes a value of 1 if no value has been provided.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 39, page 94.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 39, page 124.

The Order entry selects the interpolation method. A value of 1 selects linear interpolation between the nearest sample points. A value of 3 selects cubic spline interpolation. Cubic interpolation produces smoother results but requires more computation.