======= Objective of the WP =======


The objectives of this WP are:
  - To find out how to get accurate matches between observed and theoretical frequencies computed for the PLATO pipelines
  - To find the right oscillation code for the theoretical frequencies computation
  - Provide a version of the code to be used in the pipeline 


^Current frequency precision (2019)|
|:!: 0.1 μHz (around υ_max)|





===== ESTA/CoRoT (2008) Precision results ===== 

Summary of the oscillation frequency comparison results **[[[data:bibliography|biblio [1]]]** using the codes: ADIPLS, FILOU, NOSC, LOSC, GRACO, OSCROX, PULSE, POSC and LNAWENR.

^Conclusions ^ Comment |
|1          | 4K yields 0.02μHz precision, 2K yields 0.5 μHz precision (in average).   |
|2          | 2K does not properly distribute mesh points in the boundaries of the BV, 4K has no those problems |
|3          | O(2)+Richardson Extrapolation indistinguishable from O(4) neither for 4K nor for 2K|
|4          | r or r/P as integration variable may introduce errors if G is not consistent|       
|5          | Eulerian P / Lagrangian P as eigenfunction (modifies BV frequency, euP). May have an impact if thermodynamical quantities are not internally consistent (e.g. OPAL tables) |
|6          | 2K not adequate for large/small separations. 4K yields frequency differences below obs precision|
|7          | Proper sampled BV is key to avoid numerical bias. 4K partially overcome the problem|
|8          | G constant inconsistencies affect the frequencies comparison (up to 0.3-0.4 μHz !). Should be taken from the model|