diff --git a/lrftubes.lyx b/lrftubes.lyx
index 1291133..d1560e0 100644
--- a/lrftubes.lyx
+++ b/lrftubes.lyx
@@ -3917,6 +3917,326 @@ negative:
 \end_inset
 
 
+\end_layout
+
+\begin_layout Chapter
+Segment properties and parameters
+\begin_inset CommandInset label
+LatexCommand label
+name "chap:Segment-properties"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Section
+Introduction
+\end_layout
+
+\begin_layout Standard
+Each segment has various properties and user-set parameters.
+ This chapter provides a basic reference to these items.
+ Which properties and parameters are available differs for each segment.
+\end_layout
+
+\begin_layout Section
+Parameters
+\end_layout
+
+\begin_layout Subsection
+Radius, diameter, area
+\end_layout
+
+\begin_layout Standard
+Most segments require a measure for the cross-sectional area.
+ For ease of use, this can be entered as either the radius
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset Formula $r$
+\end_inset
+
+, diameter
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset Formula $D$
+\end_inset
+
+ or cross-sectional area
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset Formula $S$
+\end_inset
+
+.
+ The letter is followed by either a capital
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset Formula $L$
+\end_inset
+
+ for the left node or 
+\begin_inset Formula $R$
+\end_inset
+
+ for the right, e.g.
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset Formula $rL=0.2$
+\end_inset
+
+.
+ To avoid interpretation errors, they should be entered as keyword arguments,
+ e.g.
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset Formula $\mathrm{ConeDuct}(L=1,rL=0.2,rR=0.3)$
+\end_inset
+
+ instead of 
+\begin_inset Formula $\mathrm{ConeDuct}(1,0.2,0.3)$
+\end_inset
+
+.
+\end_layout
+
+\begin_layout Section
+Properties
+\end_layout
+
+\begin_layout Standard
+Once a segment has been constructed, its parameters become properties and
+ can be adjusted later on.
+ For example, say 'duct' is an instance of the class PrsDuct and we want
+ to change its radius.
+ Then 
+\begin_inset Formula $\mathrm{duct}.r=2$
+\end_inset
+
+ will set it to 
+\begin_inset Formula $2$
+\end_inset
+
+ m.
+ Retrieving any measure of cross-sectional area is also possible: 
+\begin_inset Formula $x=\mathrm{duct}.D$
+\end_inset
+
+ will retrieve the diameter and save it to 
+\begin_inset Formula $x$
+\end_inset
+
+.
+\end_layout
+
+\begin_layout Standard
+On top of that, segments contain calculated properties.
+ These are listed in Table
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset CommandInset ref
+LatexCommand ref
+reference "tab:calc_seg_properties"
+plural "false"
+caps "false"
+noprefix "false"
+
+\end_inset
+
+.
+\end_layout
+
+\begin_layout Standard
+\begin_inset Float table
+wide false
+sideways false
+status open
+
+\begin_layout Plain Layout
+\noindent
+\align center
+\begin_inset Tabular
+<lyxtabular version="3" rows="4" columns="2">
+<features tabularvalignment="middle">
+<column alignment="center" valignment="top">
+<column alignment="center" valignment="top">
+<row>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+property
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+meaning
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset Formula $T(\omega)$
+\end_inset
+
+
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+Transfer matrix at radial frequency 
+\begin_inset Formula $\omega$
+\end_inset
+
+ [
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+si{rad/s}
+\end_layout
+
+\end_inset
+
+]
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset Formula $Vf$
+\end_inset
+
+
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+Volume of segment filled with fluid [
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+si{m}
+\end_layout
+
+\end_inset
+
+]
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset Formula $Z$
+\end_inset
+
+
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+(series) impedance [
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+si{Pa*s/m^3}
+\end_layout
+
+\end_inset
+
+]
+\end_layout
+
+\end_inset
+</cell>
+</row>
+</lyxtabular>
+
+\end_inset
+
+
+\begin_inset Caption Standard
+
+\begin_layout Plain Layout
+Calculated properties of segments
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\noindent
+\align center
+\begin_inset CommandInset label
+LatexCommand label
+name "tab:calc_seg_properties"
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Chapter