I uploaded the original paper it's from, if I'm reading it correctly pEC86 isn't an overexpression plasmid, it's a helper plasmid and a separate overexpression plasmid is needed for actually expressing the cytochrome of interest. pEC86 constitutively expresses the cytochrome maturation genes and doesn't need to be induced.
Here's a map: https://www.ccos.ch/bio_resources/plasmids/pec86