== FORMAT for data files ==
All data is ASCII. There are two data sets, 025photons.dat and 115photons.dat with mean counts of 2.5 photons/frame and 11.5 photons/frame respectively.
detector.dat will be needed to convert the data to images.

-- detector.dat --
The data was measured on a 194 x 185 pixel detector (one module of the LCLS PAD). Of these, only pixels in a circle of diameter 181 are relevant. The detector.dat file has a list of these pixels with the center of the circle at (0,0). The first line gives the number 
of pixels.
Thus, each pixel can be assigned a pixel number from 0 to (num_pixels - 1). This will be used in the data files.
The detarray.dat file illustrates the array.

-- ???photons.dat --
The first line gives the number of frames in the file.

Each frame is given by four lines:
1) The number of pixels with one photon.
2) The pixel numbers of these one photon pixels. These pixel numbers refer to their order in the detector.dat file.
3) The number of pixels with multiple photons.
4) For each multi-photon pixel, there is a pair of numbers: the pixel number and the photon count.