Characteristic frequencies ν_max of the various power spectral components vs. ﹩\nu _{u}﹩. The filled circles mark the results for 4U 1636−53. The other symbols mark the atoll sources 4U 0614+09, 4U 1728−34 (van Straaten et al. 2002), 4U 1608−52 (van Straaten et al. 2003), and Aql X‐1 (Reig et al. 2004) and the low‐luminosity bursters 1E 1724−3045, GS 1826−24, and SLX 1735−269 (van Straaten et al. 2005; but also see Belloni et al. 2002).