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However, some indirect evidence exists. Typically, such evidence involves the detection of long-range correlations in fluctuations. | However, some indirect evidence exists. Typically, such evidence involves the detection of long-range correlations in fluctuations. | ||
<ref>[http://link.aip.org/link/?PHPAEN/6/1885/1 B.A. Carreras et al., Phys. Plasmas '''6''', 1885 (1999)]</ref> | <ref>[http://link.aip.org/link/?PHPAEN/6/1885/1 B.A. Carreras et al., Phys. Plasmas '''6''', 1885 (1999)]</ref> | ||
Evidence for critical gradients is much more abundant. | |||
<ref>D.R. Baker et al., Phys. Plasmas '''8''', 4128 (2001)</ref> | |||
However, the existence of a critical gradient by itself does not prove the system is in a SOC state. | |||
==References== | ==References== | ||
<references /> | <references /> |