# AXIS Corrections¶

The following documentation has been extracted automatically from the comments found in the source code. Discard Parameters. object variable.

class Parameters_module.Parameters

The input variables are read from the input file. The input file is written with python syntax. The Input file is interpreted as python after a preprocessing The preprocessing was introduced at the time of HST-> PYHST transition to maintaing compatibility with:

• NO/YES meaning 0/1

• items containing FILE in their name can be initialized without using the “” which are otherwise necessary for strings

The input file has to set (some of) the following variables. To setup easily an input file you are suggested to start from one of the examples given in the doc.

AXIS_CORRECTION_FILE = ''

this file is used if DO_AXIS_CORRECTION = YES.

It can have one or two columns. The first columns is the horizontal correction. The second , if present, the vertical correction. The datas are the axis displacements. Positive value means positive displacement. In which directions? The CCD axis directions. Data are given in CCD pixel units.

DO_AXIS_CORRECTION = 0

When set to 1 ( or YES) this option activates the axis translation correction.