The detail below is from the VOR/DME RWY 17 at KLUD, UKW is the VOR. My understanding of most of the approaches I’ve studied allow descent form the holding altitude once established inbound, but this depiction seems to indicate a later descent form the holding altitude to the crossing altitude. in this case it’s only 100’, but I’m unclear on what its telling me . I’ve seen this type shown elsewhere, but can’t find an explanation in either the Instrument Flying Handbook or the Instrument Procedures Handbook. I’d appreciate all help with explanations or other sources. Thanks!