diff --git a/plotting/lecture/plotting.tex b/plotting/lecture/plotting.tex
index 22bba87..4f1f085 100644
--- a/plotting/lecture/plotting.tex
+++ b/plotting/lecture/plotting.tex
@@ -261,12 +261,12 @@ additional options consult the help.
 
 \subsection{Changing properties of a line plot}
 
-Die properties of line plots can be changed by passing more arguments
-to the \varcode{plot} function. The command show in
-listing\,\ref{settinglineprops} creates line plot using the dotted
-line style, setting the line width to 1.5pt, a red line color is
-chosen, and star marker symbols will be used. Finally the name of the
-curve is set to 'plot 1' which will be displayed in a legend, if
+The properties of line plots can be changed by passing more arguments
+to the \varcode{plot} function. The command shown in
+listing\,\ref{settinglineprops} creates a line plot using the dotted
+line style, sets the line width to 1.5pt, a red line color is
+chosen, and star marker symbols is used. Finally, the name of the
+curve is set to \emph{plot 1} which will be displayed in a legend, if
 chosen.
 
 \begin{lstlisting}[label=settinglineprops, caption={Setting line properties when calling \varcode{plot}.}]
@@ -277,7 +277,7 @@ chosen.
 \begin{important}[Choosing the right color.]
   Choosing the perfect color goes a little bit beyond personal
   taste. When creating a colored plot you may want to consider the
-  following:
+  following points:
   \begin{itemize}
   \item A substantial amount (about 9\%) of the male population can
     not distinguish between red and green.
@@ -293,13 +293,13 @@ The first thing a data plot needs are axis labels with a correct
 unit. By calling the functions \code[xlabel]{xlabel('Time [ms]')} and
 \code[ylabel]{ylabel{'Voltage [mV]'}} these can be set. By default the
 axes will be scaled to show the whole data range. The extremes will be
-selected as the closest integer for small values of the next full
+selected as the closest integer for small values or the next full
 multiple of tens, hundreds, thousands, etc.\ depending on the maximum
-value. If these defaults do not match our needs the limits of the axes
-can be explicitly set with the functions \code[xlim()]{xlim()} and
-\code[ylim()]{ylim()} functions. To do this, the functions expect a
-single argument that is a vector containing the minimum and maximum
-value. Table\,\ref{plotaxisprops} list some of the commonly adjusted
+value. If these defaults do not match our needs, the limits of the
+axes can be explicitly set with the functions \code[xlim()]{xlim()}
+and \code[ylim()]{ylim()}. To do this, the functions expect a single
+argument, that is a vector containing the minimum and maximum
+value. Table\,\ref{plotaxisprops} lists some of the commonly adjusted
 properties of an axis. These properties can be set using the
 \code[set()]{set()} function. The \code{set} function expects as a
 first argument a \enterm{handle} of the affected axis. An axis handle
@@ -307,8 +307,9 @@ of the current plot is returned by the \code[gca]{gca} function (gca
 stands for ``get current axis''). The following arguments passed to
 \code{set} are pairs of the property name and the desired value. It is
 possible to set any number of properties using a single call to
-\code{set}. See listing\,\ref{niceplotlisting} (lines 20 and 21) for an
-example.
+\code{set}. See listing\,\ref{niceplotlisting} (lines 20 and 21) for
+an example (these commands could be joined into a single call to
+\code{set} but have been split for better readability).
 
 \begin{table}[tp] 
   \titlecaption{Incomplete list of axis properties.}{For a complete
@@ -317,18 +318,18 @@ example.
     value of a property it will be listed first.}\label{plotaxisprops}
   \begin{tabular*}{1\textwidth}{lp{5.8cm}p{5.5cm}} \hline
     \textbf{property} & \textbf{Description} & \textbf{options} \erh
-    \\ \hline \code{Box} & Defines whether the axes are drawn an all
+    \\ \hline \code{Box} & Defines whether the axes are drawn on all
     sides. & $\{'on'|'off'\}$ \erb\\
     \code{Color} & Background color of the drawing area, not the whole figure. & Any RGB or CMYK
     values. \\
     \code{FontName} & Name of the font used for labeling. & Installed fonts. \\
-    \code{FontSize} & Fontsize used for labels. & any scalar value.\\
+    \code{FontSize} & Size of the font used for labels. & Any scalar value.\\
     \code{FontUnit} & Unit in which the font size is given. & $\{'points' | 'centimeters' | 'inches',
     ...\}$\\ \code{FontWeight} & Bold or normal font. & $\{'normal' | 'bold'\}$\\
     \code{TickDir} & Direction of the axis ticks. & $\{'in' | 'out'\}$\\
-    \code{TickLength} & Length of the ticks. & scalar value\\
+    \code{TickLength} & Length of the ticks. & A scalar value\\
     \code{X-, Y-, ZDir} & Direction of axis scaling. Zero bottom/left, or not?  & $\{'normal' | 'reversed'\}$\\
-    \code{X-, Y-, ZGrid} & Defines whether grid line for the respective axes should be plotted? &
+    \code{X-, Y-, ZGrid} & Defines whether grid lines for the respective axes should be plotted? &
     $\{'off'|'on'\}$ \\
     \code{X-, Y-, ZScale} & Linear of logarithmic scaling? & $\{'linear' | 'log'\}$\\
     \code{X-, Y-, ZTick} & Position of the tick marks. & Vector of positions.\\
@@ -337,10 +338,12 @@ example.
 \end{table}
 
 
-\subsection{Changing the figure properties}
+\subsection{Changing figure properties}
 
 \begin{table}[tp]
-  \titlecaption{Incomplete list of available figure properties.}{For a complete reference consult the \matlab{} help or select the property editor while having the figure background selected
+  \titlecaption{Incomplete list of available figure properties.}{For a
+    complete reference consult the \matlab{} help or select the
+    property editor while having the figure background selected
     (\figref{ploteditorfig}).}\label{plotfigureprops}
   \begin{tabular*}{1\textwidth}{lp{6.6cm}p{5.7cm}} \hline
     \textbf{property} & \textbf{description} & \textbf{options}
@@ -354,15 +357,15 @@ example.
   \end{tabular*}
 \end{table}
 
-Like axes also the whole figure has several properties that can be
-adjusted to the current needs. Most notably the paper (figure) size
-and the placement of the axes on the
-paper. Table\,\ref{plotfigureprops} lists commonly used ones. For a
-complete reference check the help. To change the properties, we again
-use the \code{set()} function. The first argument is now a handle to
-the current figure, not the current axis as before. Analogously to the
-\code{gca} command there is a \code{gcf} (``get current figure'')
-command with which the handle can be retrieved.
+Like axes, also figure has several properties that can be adjusted to
+the current needs. Most notably the paper (figure) size and the
+placement of the axes on the paper. Table\,\ref{plotfigureprops} lists
+commonly used properties. For a complete reference check the help. To
+change the properties, we again use the \code{set()} function. The
+first argument is now a handle to the current figure, not the current
+axis as before. Analogously to the \code{gca} command there is a
+\code{gcf} (``get current figure'') command with which the handle can
+be retrieved.
 
 The script shown in the listing\,\ref{niceplotlisting} exemplifies
 several features of the plotting system and automatically generates
@@ -370,10 +373,11 @@ and saves figure\,\ref{spikedetectionfig}. With any execution of this
 script exactly the same plot will be created. If we decided to plot a
 different recording, the format will stay exactly the same, just the
 data changes. Of special interest are the lines 22 and 23 which set
-the size of the figure and line 26 which saves the figure in the 'pdf'
-format to file. When calling the function \code{saveas()} the first
-argument is the current figure handle a, the second the file name, and
-the last one defines the output format (box\,\ref{graphicsformatbox}).
+the size of the figure and positions the axes on the paper. Line 26
+finally saves the figure in the 'pdf' format to file. When calling the
+function \code{saveas()} the first argument is the current figure
+handle, the second the file name, and the last one defines the
+output format (box\,\ref{graphicsformatbox}).
 
 \begin{figure}[t]
   \includegraphics{spike_detection} \titlecaption{Automatically
@@ -387,11 +391,11 @@ the last one defines the output format (box\,\ref{graphicsformatbox}).
   \item \enterm{Bitmaps}
   \item \enterm{Vector graphics}
   \end{enumerate}
-  When using bitmaps a color is given for each pixel of the stored
-  figure. Bitmaps do have a fixed resolution (e.g.\,300\,dpi --- dots
-  per inch), they are very useful for photographs. In the contrary
-  vector graphics store descriptions of the graphic in terms of so
-  called primitives (lines, circles, polygons, etc.). The main
+  When using bitmaps a color value is given for each pixel of the
+  stored figure. Bitmaps do have a fixed resolution (e.g.\,300\,dpi
+  --- dots per inch), they are very useful for photographs. In the
+  contrary, vector graphics store descriptions of the graphic in terms
+  of so called primitives (lines, circles, polygons, etc.). The main
   advantage of a vector graphic is that it can be scaled without a
   loss of quality.
 
@@ -445,7 +449,7 @@ A very common scenario is to combine several plots in the same
 figure. To do this we create so-called subplots
 figures\,\ref{regularsubplotsfig},\,\ref{irregularsubplotsfig}. The
 \code[subplot()]{subplot()} command allows to place multiple axes onto
-a single paper. Generally, \varcode{subplot} expects three argument
+a single sheet of paper. Generally, \varcode{subplot} expects three argument
 defining the number of rows, column, and the currently active
 plot. The currently active plot number starts with 1 and goes up to
 $rows \cdot columns$ (numbers in the subplots in
@@ -465,10 +469,10 @@ figures\,\ref{regularsubplotsfig}, \ref{irregularsubplotsfig}).
   basicstyle=\ttfamily\scriptsize]{regular_subplot.m}
 
 By default, all subplots have the same size, if something else is
-desired, e.g., one subplot should span a whole row, while two others
-are smaller and placed side by side in the same row, the third
-argument of \varcode{subplot} can be a vector or numbers that should
-be joined. These have, of course, be adjacent numbers
+desired, e.g.\ one subplot should span a whole row, while two others
+are smaller and should be placed side by side in the same row, the
+third argument of \varcode{subplot} can be a vector or numbers that
+should be joined. These have, of course, to be adjacent numbers
 (\figref{irregularsubplotsfig},
 listing\,\ref{irregularsubplotslisting}).
 
@@ -493,6 +497,48 @@ used cells of the grid by passing a vector as the third argument to
   basicstyle=\ttfamily\scriptsize]{irregular_subplot.m}
 
 
+\subsection{Show estimation errors}
+The repeated measurements of a quantity almost always results in
+varying results. Neuronal activity, for example is notoriously
+noisy. The responses of a neuron to repeated stimulation with the same
+stimulus may share common features but are different each time. This
+is the reason we calculate measures that describe the variability of
+such as the standard deviation and thus need a way to
+illustrate it in plots of scientific data. Providing an estimate of
+the error gives the reader the chance of assessing the reliability of
+the data and get a feeling of possible significance of a
+difference in the average values.
+
+\Matlab{} offers several ways to plot the average and the error. We
+will introduce two possible ways.
+\begin{itemize}
+\item The \code[errorbar()]{errorbar} function (figure\,\ref{errorbarplot}).
+\item Using the \code[{fill()]{fill} function to draw an area showing
+  the spread of the data (figure\,\ref{errorareaplot}).
+\end{itemize}
+
+\subsubsection{Errorbar}
+
+Using the \code[errorbar()]{errorbar} function is rather straight
+forward. In its easiest form, it expects three arguments being the x- and y-values plus the
+error.
+
+\begin{figure}[ht]
+  \includegraphics[]{} \titlecaption{Adding error bars to a line
+    plot}{\textbf{A} symmetrical error around the mean (e.g. using the
+    standard deviation). \textbf{B} asymmetrical errors (e.g. the
+    lower and upper quartiles). \textbf{C} X- and Y-error. See
+    listing\,\ref{errorbarlisting}}\label{errrorbarplot}
+\end{figure}
+
+
+\begin{figure}[ht]
+  \includegraphics[]{}
+  \titlecaption{}\label{errrorareaplot}
+\end{figure}
+
+
+
 \subsection{Annotations, text}
 
 Sometimes want to highlight certain parts of a plot or simply add an
@@ -521,13 +567,13 @@ documentation.
 
 \begin{important}[Positions in data or figure coordinates.]
   A very confusing pitfall are the different coordinate systems used
-  by \varcode{text} and \varcode{annotation}. While text expects the
-  positions to be in data coordinates, i.e.\,in the limits of the x-
-  and y-axis, \varcode{annotation} requires the positions to be given
-  in normalized figure coordinates. Normalized means that the width
-  and height of the figure are expressed by numbers in the range 0 to
-  1. The bottom/left corner then has the coordinates $(0,0)$ and the
-  top/right corner the $(1,1)$.
+  by \varcode{text} and \varcode{annotation}. While \varcode{text}
+  expects the positions to be in data coordinates, i.e.\,in the limits
+  of the x- and y-axis, \varcode{annotation} requires the positions to
+  be given in normalized figure coordinates. Normalized means that the
+  width and height of the figure are expressed by numbers in the range
+  0 to 1. The bottom/left corner then has the coordinates $(0,0)$ and
+  the top/right corner the $(1,1)$.
 
   Why different coordinate systems? Using data coordinates is
   convenient for annotations within a plot, but what about an arrow