hallo liebe community

ich habe einige grafiken in meinem text, dies mir in die nächste section verschiebt. wie kann ich die grafik zwingen an dem ort im textlichen zusammenhang zu bleiben wo ich sie auch hinsetze?
danke schonmal
lydia


hier mal mein code

\noindent
With the found values, a calibration curve that delivers the wavelength for a specific angle of deflexion was made.

\begin{figure}[!htpb]
\begin{center}
\includegraphics[width=12cm]{SPE_kalibrationskurve.png}
\caption{calibration curve $\lambda(\delta_{min})$}
\end{center}
\end{figure}




\noindent
The following wavelengths were obtained for the measured angles of deflexion of the emission lines of the unknown lamp.


\begin{table}[!htpb]
\begin{center}
\begin{tabular}{|@{ }l | l | l @{ }|}
\hline
$\lambda /[$\AA$]$ with standard error & $\lambda /[$\AA$]$ exact & intensity\\
\hline
4400(300)&4384&weak\\
4500(400)&4486&strong\\
4700(400)&4718&weak\\
4900(400)&4936&weak\\
5000(400)&4993&medium\\
6000(600)&5959&strong\\
6800(800)&6785&medium\\
7000(1000)&7216&medium\\
\hline
\end{tabular}
\end{center}
\end{table}

%

\begin{table}[!htpb]
\begin{center}
\medskip\noindent
\begin{tabular}{|@{ }c | c | c @{ }|}
\hline
length of light bar in the center $/[cm]$ & value on microscrew scale$/[\mu m]$&distance to wall $/[cm]$\\
\hline
4.7 & 50 & 153\\
2.9 & 80 & 153\\
2.4 & 100 & 153\\
1.6 & 130 & 153\\
1.2 & 175 & 153\\
\hline
\end{tabular}
\caption{measurement of slid width of a portable monochromator}
\end{center}
\end{table}


\begin{figure}[!htpb]
\begin{center}
\includegraphics[width=12cm]{graph_spaltbreite.pdf}
\caption{blablabla?????}
\end{center}
\end{figure}

\section{discussion}
The spectrum of the unknown lamp was compared with the nine emission spectra of the possible atoms and fit almost perfectly with the one of helium. So the unknown lamp was a helium lamp, that has following emission lines:
\end{document}