Table 4: Summary of the optical properties of the sources at 0.4<z<0.6 observed with HST and results of our study on the images. Note that only one source of our sample (classified as HEG) has no HST data available (3C 327.1). 3C 275 has also been excluded because of a cosmic ray event in the central region of the HST image (see text, Sect.3).
CCC detections Optical upper limits Complex morphology TOT % CCC detections

BLO 8 - - 8 $100\%$

LEG 1 3 1 5 $20\%$

HEG 3 6 4 13 $21\%$

All sources 12 9 5 26 $44\%$

**Table 4:** Summary of the optical properties of the sources at 0.4<z<0.6 observed with HST and results of our study on the images. Note that only one source of our sample (classified as HEG) has no HST data available (3C 327.1). 3C 275 has also been excluded because of a cosmic ray event in the central region of the HST image (see text, Sect.3).
	CCC detections	Optical upper limits	Complex morphology	TOT	% CCC detections
BLO	8	-	-	8	$100\%$
LEG	1	3	1	5	$20\%$
HEG	3	6	4	13	$21\%$
All sources	12	9	5	26	$44\%$

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