*UG - Add hint from users list

lib/doc/UserGuide.lyx

@@ -1,4 +1,4 @@
-#LyX 2.4 created this file. For more info see https://www.lyx.org/
+#LyX 2.5 created this file. For more info see https://www.lyx.org/
 \lyxformat 620
 \begin_document
 \begin_header
@@ -158,6 +158,7 @@ logicalmkup
 \docbook_table_output 0
 \docbook_mathml_prefix 1
 \author -584632292 "Richard Kimberly Heck"
+\author 5863208 "ab"
 \end_header
 
 \begin_body
@@ -9643,14 +9644,12 @@ Verbatim
 \end_layout
 
 \begin_layout Verbatim
-
 This is Verbatim.
 \end_layout
 
 \begin_layout Verbatim
 \noindent
 \align block
-
 The following 2 lines are empty:
 \end_layout
 
@@ -9663,7 +9662,6 @@ The following 2 lines are empty:
 \end_layout
 
 \begin_layout Verbatim
-
 Almost everything is allowed in Verbatim:"%&$§#~'`
 \backslash
 }][{|
@@ -9687,7 +9685,6 @@ Verbatim
 \end_layout
 
 \begin_layout Verbatim*
-
 This is Verbatim*.
 \end_layout
 
@@ -22605,7 +22602,50 @@ name "subsec:Image-Formats"
 \end_layout
 
 \begin_layout Standard
-You can insert images in any known file format.
+You can insert images
+\change_inserted 5863208 1701369912
+
+\begin_inset Foot
+status open
+
+\begin_layout Plain Layout
+
+\change_inserted 5863208 1701371417
+Apart from static images specific scripts generating images can be used as well.
+ For example one can use Gnuplot script (files with 
+\begin_inset Quotes eld
+\end_inset
+
+
+\family typewriter
+.gp
+\begin_inset Quotes erd
+\end_inset
+
+
+\family default
+ or
+\family typewriter
+ 
+\begin_inset Quotes erd
+\end_inset
+
+.gnuplot
+\begin_inset Quotes erd
+\end_inset
+
+
+\family default
+ extension) instead of image filename.
+\change_unchanged
+
+\end_layout
+
+\end_inset
+
+
+\change_unchanged
+ in any known file format.
  But as we explained in section
 \begin_inset space ~
 \end_inset