update to marker colour scheme
update to marker colour scheme

MLR-au/olac-visualisation,MLR-au/pdsc-olac-visualisation,MLR-au/olac-visualisation,MLR-au/pdsc-olac-visualisation,MLR-au/pdsc-olac-visualisation,MLR-au/pdsc-olac-visualisation,MLR-au/olac-visualisation,MLR-au/olac-visualisation