> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Interpretation note

export const productName = "Atoti FRTB";

The FAQ for [MAR21.8](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_8) specifies that inflation and cross-currency
bases should be considered for Vega risk factors, without an underlying
residual maturity dimension. However, [MAR21.93](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_93) and
[MAR21.94](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_94) do not specify the correlation parameter $\rho_{kl}$ when
one of the underlyings is an Inflation or Basis curve (and hence do not
have an underlying maturity).

In {productName}, when one of the underlying curves is an
inflation or cross-currency basis curve, we use [MAR21.94](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_94) with
$\rho_{kl}^{(DELTA)}$ equal to 0% or 40% as determined by [MAR21.48](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_48) and [MAR21.49](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_49).