Projecting Cash flow as per S-Curve

[Naiyer]

I need a formula for doing cash flow projection.

I have the s-curve (Cumulative Time vs Cumulative Cost).

The total cost is provided and the time period during which this will happen.

Now I need to find the monthly cash flow per the s-curve (or distribution curve).

Can someone please guide me how to do this.

Thanks in advance.

The excel file can be downloaded from https://skydrive.live.com/redir?resid=9F6CAF43EE3A0818!115&authkey=!AFf3a7TlgmVDaxI

Thanking again.

Naiyer