minor refactoring

source/db2-presentation.tex

@@ -307,7 +307,6 @@ This analysis focuses on the performance degradation of a read-only workload wit
 
 \begin{frame}
 \frametitle{YCSB benchmark}
-
 \begin{figure}
 \caption{YCSB write-heavy workload.}
 \centering
@@ -327,8 +326,6 @@ There is related research in progress in this direction:
 \end{block}
 \end{frame}
 
-
-
 \begin{frame}
 \frametitle{License}
 \centering