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\begin{figure}[htbp]
\ifthenelse{\equal{IJMPB}{\TschStyle}}{%
\centerline{\psfig{file=PictureLarge_nb001_.eps,width=5.00in}}
}{}%
\ifthenelse{\equal{arXiv}{\TschStyle}}{%
\centerline{\includegraphics[scale=1.00]{PictureSmall_nb001_.png}}
}{}%
\ifthenelse{\equal{TeX4ht}{\TschStyle}}{%
\centerline{\includegraphics[scale=1.00]{PictureLarge_nb001_.png}}
}{}
\vspace*{8pt}
\caption{Black body radiation compared to the 
         radiation of a sample coloured body.
         The non-universal constant $\sigma$ 
         is normalized in such a way that
         both curves coincide at $T=290\,{\rm K}$. 
         The Stefan-Boltzmann $T^4$ law does 
         no longer hold in the latter case,
         where only two bands are integrated
         over, namely that of visible light 
         and of infrared radiation from 
         $3\,\mu{\rm m}$ to $5\,\mu{\rm m}$,
         giving rise to a steeper curve.}
\label{Fig:nb001}
\end{figure}
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