Reflectometer D17

D17 has a standard ILL data format.  It has three parameter blocks before the data.  

Note that the data block (which comes last) may be read in as a 1D array.  The array then needs to be reshaped.

The data from the old detector (pre-2010) saves data that should be read

1. vertically, then
2. horizontally, then
3. in time of flight

Data from the new detector (from 2010) is arrayed starting from the top left of the detector (looking from the sample).  The data then needs to be arranged:

1. in time of flight, then
2. horizontally, then
3. vertically

In both cases the data will have been histogrammed, i.e. the detector pixels and time structure will have been grouped in a certain manner.  This information is saved in the data file.  All the following parameters are from the yellow block:

1. The number of horizontal pixels is [parameter(98) — parameter(97) + 1] / parameter(101)
2. The number of vertical pixels is [parameter(99) — parameter(100) + 1] / parameter(101)
3. The number of time-of-flight scannels is parameter(94)

An example of the parameter blocks is given below.  You can also download a PDF of the file format here.