Left panels: variation in total Ca ii K column density between the limits in LSR km s-1 shown on the figures as a function of star-to-star sky separation in degrees as observed by FLAMES-GIRAFFE. Right panels: corresponding percentage variation in observed Ca ii K equivalent width. a), b): NGC 330, c), d): NGC 346, e), f): NGC 1761, g), h): NGC 2004.
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