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reduce 1.6 scaling BNS chirp mass to 0.9 solar masses

Colm Talbot requested to merge modify-chirp-mass-limits into master

This MR will make all binaries with trigger chirp mass in the range 0.9 < mc < 1.43 use a ROQ scale factor of 1.6, rather than the current 1.3 < mc < 1.43.

This limit was chosen as 0.9 ~= 1.43 / 1.6.

This should allow more low mass triggers to use all the data from 32 Hz, rather than 40 Hz.

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