/usr/share/dx/samples/programs/Histogram.cfg is in dxsamples 4.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// time: Tue Apr 29 09:09:55 1997
//
// version: 3.1.1 (format), 3.1.4 (DX)
//
//
// node Image[2]:
// title: value = One-Dimensional Histogram
// depth: value = 24
// window: position = (0.6625,0.0166), size = 0.2937x0.3848
// input[1]: defaulting = 0, value = "Image_2"
// input[4]: defaulting = 0, value = 1
// input[5]: defaulting = 0, value = [-8.19394 7.19326 0]
// input[6]: defaulting = 0, value = [-8.19394 7.19326 140.249]
// input[7]: defaulting = 0, value = 75.1596
// input[8]: defaulting = 0, value = 362
// input[9]: defaulting = 0, value = 0.896
// input[10]: defaulting = 0, value = [0 1 0]
// input[11]: defaulting = 1, value = 30.0001
// input[12]: defaulting = 0, value = 0
// input[14]: defaulting = 0, value = 1
// input[15]: defaulting = 1, value = "none"
// input[16]: defaulting = 1, value = "none"
// input[17]: defaulting = 1, value = 1
// input[18]: defaulting = 1, value = 1
// input[19]: defaulting = 0, value = 0
// input[29]: defaulting = 1, value = 0
// input[42]: defaulting = 0, value = "One-Dimensional Histogram"
// internal caching: 1
// interaction mode = NONE
//
// node Image[3]:
// title: value = Two-Dimensional Histogram
// depth: value = 24
// window: position = (0.2664,0.0244), size = 0.3906x0.3789
// input[1]: defaulting = 0, value = "Image_3"
// input[4]: defaulting = 0, value = 1
// input[5]: defaulting = 0, value = [16.7142 -7.74729 31.4726]
// input[6]: defaulting = 0, value = [93.1423 -205.39 119.15]
// input[7]: defaulting = 0, value = 186.65
// input[8]: defaulting = 0, value = 486
// input[9]: defaulting = 0, value = 0.709
// input[10]: defaulting = 0, value = [-0.105753 0.368777 0.923483]
// input[11]: defaulting = 1, value = 44.2878
// input[12]: defaulting = 0, value = 0
// input[14]: defaulting = 0, value = 1
// input[15]: defaulting = 1, value = "none"
// input[16]: defaulting = 1, value = "none"
// input[17]: defaulting = 1, value = 1
// input[18]: defaulting = 1, value = 1
// input[19]: defaulting = 0, value = 0
// input[29]: defaulting = 0, value = 1
// input[30]: defaulting = 0, value = {"x-velocity", "number", "z-velocity"}
// input[31]: defaulting = 0, value = 20
// input[41]: defaulting = 0, value = "rotate"
// input[42]: defaulting = 0, value = "Two-Dimensional Histogram"
// internal caching: 1
//
// node Image[4]:
// title: value = Three-Dimensional Histogram
// depth: value = 24
// window: position = (0.2977,0.4414), size = 0.5133x0.4893
// input[1]: defaulting = 0, value = "Image_4"
// input[4]: defaulting = 0, value = 1
// input[5]: defaulting = 0, value = [47.2189 22.2307 30.9473]
// input[6]: defaulting = 0, value = [123.528 111.968 246.584]
// input[7]: defaulting = 0, value = 231.81
// input[8]: defaulting = 0, value = 643
// input[9]: defaulting = 0, value = 0.712
// input[10]: defaulting = 0, value = [-0.0597501 0.928921 -0.365425]
// input[11]: defaulting = 1, value = 50.5073
// input[12]: defaulting = 0, value = 0
// input[14]: defaulting = 0, value = 1
// input[15]: defaulting = 1, value = "none"
// input[16]: defaulting = 1, value = "none"
// input[17]: defaulting = 1, value = 1
// input[18]: defaulting = 1, value = 1
// input[19]: defaulting = 0, value = 0
// input[29]: defaulting = 0, value = 1
// input[30]: defaulting = 0, value = {"x-velocity", "y-velocity", "z-velocity"}
// input[31]: defaulting = 0, value = 30
// input[41]: defaulting = 0, value = "rotate"
// input[42]: defaulting = 0, value = "Three-Dimensional Histogram"
// internal caching: 1
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