What is the difference between the Monthly and DeltaMonthly input sheet for production profile input?

On the Monthly sheet you will input a certain starting point for your production profile using a month and year to define it. The DeltaMonthly sheet is most useful for new wells which have not been put in production yet, and which is typically connected to a drilling schedule, so the month number is a relative number related to the start of the production of the well. How you organize your drilling schedule will impact when the production profile comes into production.