CB
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The short 
marks suggest emphasising the dissonant chord. The former, reaching slightly further into b. 2, could be even interpreted as a reversed long accent. According to us, just like in the case of other complementary indications, these marks may be used in the version of the main text too.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Scope of dynamic hairpins
notation: Articulation, Accents, Hairpins