From the Curve panel's Attribute tab, you can define the scale and offset for the X and Y vectors.  When a data vector is scaled, the vector is multiplied by a specified value.  The original data values are not actually altered.  Offsetting a data vector shifts the data along the corresponding axis.

You can enter math expressions, such as one for converting Fahrenheit to Celsius, in the scale and offset fields.

Curves panel – Attributes tab