\documentstyle[%
  slidesonly,%  Try notes or notesonly instead.
  %notes,%      Use instead of slidesonly to typeset the notes.
  %notesonly,%  Use instead of slidesonly to typeset notes and slides.
  %epsf,%	martin says use this if figure.
  pstricks,gradient,% use gradient background blue
  semcolor,%   Try me if using PSTricks.
  colordvi,%   maybe not necessary
  epsf, %      For figure inclusion
  %semrot,%     Try me if using Rokicki's dvips.
  %semhelv,%    Try me if using a PostScript printer.
  %semlcmss,%   Try me, using slitex fonts
  %article,%    Try me.
  %portrait,%   Try me.
  %sem-a4,%     Try me if using A4 paper.
  semlayer%     This must be included, but you need the semcolor option to
  ]{seminar}                                  % actually see the overlays.

% no pagenumber, nothing
\newpagestyle{seppagestyle}{\relax}{\relax}
\slidepagestyle{seppagestyle}

%\epsfslidesize            % if using epsf macros


\newif\ifcoloratall 		\coloratalltrue
				\def\colorall{\coloratalltrue}
				\def\nocoloratall{\coloratallfalse}
\newif\iftransparency          \transparencytrue

%\nocoloratall
%\transparencytrue
\transparencyfalse

\slidesmag{5}
\articlemag{1}

%\twoup                     % Try me for twoup printing.
%\printlandscape		   % do not use this with twoup

%\portraitonly              % To print only portrait slides
%\landscapeonly             % To print only landscape slides

%\notslides{\ref{questions}-7,1}   %Try me: The slides are omitted.
%\onlyslides{\ref{questions}-7,1}  %Try me: Only these slides are included.
%\onlynotestoo                     %Try me: For selecting notes as well.

%\colorlayers{red,blue}      % Try deleting this if using the semcolor option,
                            % to get \blue and \red to use PostScript color.

%\overlaysfalse             % Suppress overlays with semcolor option.
%\layersfalse               % Suppress color layers with semcolor option.

\rotateheaderstrue          % Try this out if using rotation macros.

\ifcoloratall
\iftransparency
% Original colors
% good for tranparencies: light blue gradient, with black writing
\slideframe[\psset{fillstyle=gradient}]{scplain}% gradient background
\else
% SEP colors
\newrgbcolor{SEPblue}{0.0 0.12 0.5}  %  SEP standard blue
\newrgbcolor{SEPviolet}{0.25 0.12 0.5}   % dark violet
\newrgbcolor{SEPlightblue}{0.5 0.5 1.0}   % lighter SEP blue
\ifarticle\else
% Martin's gradient
%\slideframe[\psset{fillstyle=gradient,%
%                   gradbegin=SEPblue,gradend=SEPlightblue}%
%           ]{scplain}% gradient background
%
% tradidional: good for slides
\slideframe[\psset{fillstyle=solid,%
                   fillcolor=SEPblue}%
           ]{scplain}% solidbackground

\slideframe{none}

%
% text color
\textYellow
%
\fi
\fi
\else
\fi
\newcommand{\sref}[1]{SLIDE \ref{#1}}

\def\postbackblue{
\special{! userdict
  begin /bop-hook{
  gsave
  0.0 0.12 0.5 setrgbcolor clippath fill
  grestore }
  def end
}}

\postbackblue

\newcommand{\heading}[2]{\label{#1}\begin{center}\large\bf #2\end{center}
\Red{\hbox{\rule{\textwidth}{0.5mm}} } }

%\newcommand{\slidehead}[1]{%
%  \begin{center}
%    \large\bf
%    \shadowbox{#1}%
%  \end{center}
%  \vspace{1ex minus 1ex}}
\title{\large\bf Three-dimensional filtering}
\vspace*{0.5in}
\author{Jon Claerbout\\ Matthias Schwab\\ Curt Holden\\ \\ \rm Stanford University\\ http://sepwww.stanford.edu/sep/prof/tdf}
\date{SEG, November 1996}
\date{}



%\newpagestyle{MH}%
%  {University of Guaduas, March 13, 1998\hfil\thepage}{}
%\pagestyle{MH}

\newcommand\mat[1]{\rm\bf #1}
\newcommand\Smallsize{\relax}

\begin{document}

\maketitle          % This won't show up when \onlynotestoo is in effect.

\begin{slide}
  \ifslidesonly              % Title slide only for slidesonly selection.
    \maketitle
    \addtocounter{slide}{-1}
    \slidepagestyle{empty}
  \fi
\end{slide}

this is the title slide, now for more

\begin{slide} 
\heading{research}{Prediction-error filter in 2-D}
\vspace*{+0.25in}
\bf
\begin{center}
\begin{tabular}{lll}
residual     & $\perp$ &  fitting function \\
output at A  & $\perp$ &  each input to A \\
output at A  & $\perp$ &  each input to B \\
output at A  & $\perp$ &  linear combination of each input to B \\
output at A  & $\perp$ &  output at B
\end{tabular}
\par  For fuller explanation, see my free book:
\par  http://sepwww.stanford.edu/sep/prof/tdf
\end{center}
\end{slide}

\begin{slide} 
\heading{research}{curl grad =0 and LOMOPLAN}
\vspace*{+0.25in}
\bf
\par\noindent   LOMOPLAN:  LOcal MOnoplane ANnihilation
$$
{\rm curl}
      = \left[
	\left(  {\partial \over\partial x} - {\partial \over\partial y}
	\right),
	\left(  {\partial \over\partial z} - {\partial \over\partial x}
	\right),
	\left(  {\partial \over\partial y} - {\partial \over\partial z}
	\right)
	\right]
$$
\par\noindent  
${\partial \over\partial y}$ is filter coefficients on a line.
\par\noindent  
A component of curl is filter coefficients in a plane.
\par\noindent  
${\rm curl}\ {\rm grad} =0$ means a travel time exists:
waves are not going round in circles like vortices.
\end{slide}

\begin{slide} 
\activeplot{/homes/sep/prof/tdf/iin/Fig/norms.ps}{}{}{} 
\end{slide}


\begin{slide} 
\heading{research}{Prediction-error filter in 2-D}
\vspace*{+0.25in}
\bf
\begin{center}
\begin{list}{$\bullet$}{\leftmargin=1in}
\item Introduction
\item Conclusions
\end{list}
\end{center}
\end{slide}


\end{document}