CCP Omen has posted a new developer blog on the official EVE site about changes in the planetary interaction since the advent of the full Incursion expansion. CCP Omen spends time discussion the Extractor Control Unit (ECU) and how exactly it works. Omen provides players with a great user guide complete with images and instructions on making the best use of the ECU.

Another new aspect of the extractor heads is the concept of an "uptake area". The uptake area is the area under the extractor head from which resources are being extracted. The uptake area is directly linked to the duration of the ECU's program. A longer program equals a larger uptake area. If the uptake area of an extractor head overlaps another uptake area, this overlap creates an interference zone. Interference is indicated as noise around the extractor head and a negative percentage in the ECU's extractor head list.

• Networks belonging to different players does not affect each other directly
• The only way two players affect each other is indirectly via the depletion layer
• There is no extractor head overlap between heads from different players ECU's

Read more here.