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/usr/share/gromacs/top/ps.m2p is in gromacs-data 2018.1-1.

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The actual contents of the file can be viewed below.

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; Command line options of xpm2ps override the parameters in this file
;--- Matrix options ---
black&white	no		; Obsolete
titlefont	Helvetica	; Matrix title Postscript Font name
titlefontsize	20.0		; Matrix title Font size (pt)
legend		yes		; Show the legend
legendfont	Helvetica	; Legend name Postscript Font name
legendfontsize	14.0		; Legend name Font size (pt)
legendlabel			; Used when there is none in the .xpm
legend2label			; Id. when merging two xpm's 
xbox		2.0		; x-size of a matrix element
ybox		2.0		; y-size of a matrix element
matrixspacing	20.0		; Space between 2 matrices
xoffset		0.0		; Between matrix and bounding box
yoffset		0.0		; Between matrix and bounding box
;--- Axis options; x-axis ---
x-lineat0value	= no		; Draw line at matrix value==0
x-major		= 20.0		; Major tick spacing
x-minor		= 5.0		; Id. Minor ticks
x-firstmajor	= 0.0		; Offset for major tick
x-majorat0	= no		; Additional Major tick at first frame
x-majorticklen	= 8.0		; Length of major ticks
x-minorticklen	= 4.0		; Id. Minor ticks
x-label		=		; Used when there is none in the .xpm
x-font		= Helvetica	; Axis label PostScript Font 
x-fontsize	= 16		; Axis label Font size (pt)
x-tickfont	= Helvetica	; Tick label PostScript Font
x-tickfontsize	= 10		; Tick label Font size (pt)
;--- y-axis options ---
y-lineat0value	= no
y-major		= 20.0
y-minor		= 5.0
y-firstmajor	= 0.0
y-majorat0	= no
y-majorticklen	= 8.0
y-minorticklen	= 4.0
y-label		= 
y-fontsize	= 16
y-font		= Helvetica
y-tickfontsize	= 10
y-tickfont	= Helvetica