old_contents: from .simple_broker import (DataBroker, Header, get_events, get_table)
  from .handler_registration import register_builtin_handlers
  from .pims_readers import Images, SubtractedImages
  
  register_builtin_handlers()
  
new_contents: from .simple_broker import (DataBroker, Header, get_events, get_table)
  from .handler_registration import register_builtin_handlers
  from .pims_readers import get_images
  
  register_builtin_handlers()
  
subject: Update broker-level imports.