Same SP-D multimer as previous post (and same image) rhSP-D kindly supplied by Grith Sorensen and shadowing by Jack Griffith.  It is still not possible with certainty to identify how many arms of this multimer there are, however, there clearly are 6 or more, maybe 8, and the CRD are highlighted with this method (Photoshop and eraser tool on background, mask is a color gradient on highlighted multimer, dropshadow in CorelDRAW, original image exported from photoshop as RGB, to facilitate opening in Gwyddion as original multimer (image on left). This image processing picks up a second concentric circle surrounding the N termini in the center. Peak brightness highes in orange and then red.