the thermal noise is dominant and another one where a (constant) technical noise density is relevant, in the log-log plot this will give rise to two regions, both with slope 1/2 and thus parallel, but with a slight offset induced by the transition from the frequency range dominated by thermal noise to the frequency range dominated by technical noise. [38] F. Schwabl, Statistical Mechanics, Springer Verlag, ISBN 3-540-43163-2 (2002). 26