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+.TH XScreenSaver 1 "" "X Version 11"
+.SH NAME
+gravitywell - spaaaaace.
+.SH SYNOPSIS
+.B gravitywell
+[\-display \fIhost:display.screen\fP]
+[\-visual \fIvisual\fP]
+[\-window]
+[\-root]
+[\-delay \fInumber\fP]
+[\-speed \fInumber\fP]
+[\-resolution \fInumber\fP]
+[\-grid-size \fInumber\fP]
+[\-count \fInumber\fP]
+.SH DESCRIPTION
+Massive objects distort space in a two dimensional universe.
+.SH OPTIONS
+.TP 8
+.B \-visual \fIvisual\fP
+Specify which visual to use. Legal values are the name of a visual class,
+or the id number (decimal or hex) of a specific visual.
+.TP 8
+.B \-window
+Draw on a newly-created window. This is the default.
+.TP 8
+.B \-root
+Draw on the root window.
+.TP 8
+.B \-delay \fInumber\fP
+Per-frame delay, in microseconds. Default: 30000 (0.03 seconds).
+.TP 8
+.B \-speed \fInumber\fP
+Animation speed. 2.0 means twice as fast, 0.5 means half as fast.
+.TP 8
+.B \-resolution \fInumber\fP
+Density of the underlying universe. Default: 1.0.
+.TP 8
+.B \-grid-size \fInumber\fP
+Grid Size. Smaller values are more dense. Default: 1.0.
+.TP 8
+.B \-count \fInumber\fP
+Number of stars. Default: 15.
+.SH ENVIRONMENT
+.PP
+.TP 8
+.B DISPLAY
+to get the default host and display number.
+.TP 8
+.B XENVIRONMENT
+to get the name of a resource file that overrides the global resources
+stored in the RESOURCE_MANAGER property.
+.SH SEE ALSO
+.BR X (1),
+.BR xscreensaver (1)
+.SH COPYRIGHT
+Copyright \(co 2019 by Jamie Zawinski. Permission to use, copy, modify,
+distribute, and sell this software and its documentation for any purpose is
+hereby granted without fee, provided that the above copyright notice appear
+in all copies and that both that copyright notice and this permission notice
+appear in supporting documentation. No representations are made about the
+suitability of this software for any purpose. It is provided "as is" without
+express or implied warranty.
+.SH AUTHOR
+Jamie Zawinski.