From PANS OPS Doc 8186:
1.3.1
The entry into the holding pattern shall be according to heading in relation to the three entry sectors shown in Figure IV-1-3, recognizing a zone of flexibility of 5 ̊ on either side of the sector boundaries. For holding on a VOR intersection, the entry track is limited to the radials forming the intersection. For holding on a VOR/DME fix, the entry track is limited to either the VOR radial, DME arc, or alternatively along the entry radial to a VOR/DME fix at the end of the outbound leg, as published