Table 4: Previously known  Orionis candidates in our survey.

Object	z'	i'-z'	Ia	Reference
S Ori 13	15.66  0.21	1.05  0.30	16.05	Béjar et al. (2006)
S Ori 14	15.92  0.21	1.26  0.29	16.35	Béjar et al. (1999)
S Ori 19	16.11  0.21	1.08  0.29	16.62	Béjar et al. (2006)
S Ori 23	16.43  0.21	1.14  0.29	16.88	Béjar et al. (2006)
S Ori 24	16.48  0.20	1.10  0.29	16.90	Béjar et al. (2006)
S Ori 28	16.74  0.21	1.24  0.29	17.23	Béjar et al. (2006)
S Ori J053922.2-024552	16.78  0.21	1.08  0.29	17.05	Caballero et al. (2004)
S Ori 32	16.89  0.21	1.26  0.29	17.40	Béjar et al. (2006)
KNJ2005 72	17.01  0.21	1.31  0.29	17.82	Kenyon et al. (2005)
KNJ2005 70	17.13  0.21	1.29  0.29	17.81	Kenyon et al. (2005)
KNJ2005 71	17.26  0.21	1.12  0.29	17.82	Kenyon et al. (2005)
S Ori 38	17.34  0.24	1.32  0.35	17.70	Béjar et al. (2006)
S Ori J053926.8-022614	17.69  0.21	1.15  0.30	18.25	Béjar et al. (2006)
S Ori J053918.1-025257b	17.99  0.21	1.66  0.29	18.64	Caballero et al. (2004)
S Ori J053948.1-022914	18.06  0.21	1.20  0.30	18.52	Béjar et al. (2006)
S Ori 42	18.33  0.21	1.70  0.30	19.04	Caballero et al. (2004)
S Ori 44	18.94  0.21	1.29  0.29	19.39	Béjar et al. (1999)
S Ori 45	18.99  0.21	1.58  0.30	19.49	Caballero et al. (2004)
S Ori J053929.4-024636	19.12  0.21	1.68  0.29	19.73	Caballero et al. (2004)
S Ori J053946.5-022423	19.09  0.21	1.59  0.29	20.14	Béjar et al. (2001)
S Ori 52	19.76  0.21	1.78  0.29	20.55	Béjar et al. (2006)
S Ori 53	20.42  0.22	1.85  0.31	20.96	Caballero et al. (2004)
S Ori J053956.8-025315	20.49  0.21	1.86  0.30	21.25	Caballero et al. (2004)
S Ori J053858.6-025228	21.28  0.24	1.98  0.35	22.17	Caballero et al. (2004)
S Ori 67	22.05  0.22	1.78  0.35	23.04	Béjar et al. (2006)

a I-band magnitude from the literature. b It is detected in both Palomar and Calar surveys. We provide the mean i' and z' photometry. The i' magnitudes differ by 0.3 mag suggesting photometric variability and supporting the conclusions on the source variable nature reported by Caballero et al. (2004).