# R-forecasting: high and low ell coordination

On this page we discuss and provide links for coordinating the optimization between high and low ell surveys.

Summary of plan:

**Delensing:**

Colin H. ran his foreground-cleaning code for the following cases:

fsky = [0.03, 0.05, 0.1, 0.15, 0.2, 0.3, 0.4]

Ndet_highres = 40k, 70k, 100k, 200k, 300k, 500k, 1000k

where we assume observing is for 5 years (so multiply by 5 to get detector-years). He produces Nl^BB and Nl^EE for each case. They are at the links below:

For 70k, 100k, 200k, 300k, 500k, 1000k: http://www.astro.princeton.edu/~jch/S4_pol_optimize_5m_dustGalpolsynchGalpoldeproj_atm_PSrad_fskyvars_Ndetvars.tgz

Victor is set up to turn those curves into delensing fractions.

**Low-res survey:**

Victor then runs his code for the following fsky fractions and Ndet.

fsky = [0.03, 0.05, 0.1, 0.15, 0.2, 0.3, 0.4]

Ndet_lowres = 40k, 70k, 100k, 200k, 300k, 500k, 1000k

That will mean calculating his cov mat for each case above, and then exploring combinations with delensing fractions from Colin's curves.

We will end up with a set of combinations of fsky, Ndet_low, and Net_high that reaches the S4 sigma(r) target. Of those, we will identify the ones where Ntot=Ndet_lowres + Net_highres is minimized.