ps1 = SD.get_RegPoly_xy((0,0), 
                        wfsize-2*mlength1, 
                        3)
ps2 = SD.get_RegPoly_xy((0,0), 
                        wfsize-2*mlength1-5*mlength2, 
                        3)

# add outer markers
MARKERS = []

marker = MEBL1
POINTS = zip(ps1[0],ps1[1])

for p in POINTS:
    M = SD.translate(marker, p[0],p[1])
    MARKERS += [M]
    
# add inner markers

marker = MEBL2
POINTS = zip(ps2[0], ps2[1])

for p in POINTS:
    M = SD.translate(marker, 
                     p[0], p[1])
    MARKERS += [M]
    
EBLMARKERS = SD.BRAND_NEW_STRUCTURE(MARKERS,
                                    [SD.empty()])