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BCBS 261 sets specific rules regarding to the initial margin calculation for bilateral trade (https://www.bis.org/publ/bcbs261.pdf)

In page 21, the standardized rule sets the methodology for the same which is basically

Net Margin = (0.40 + 0.60 * NGR) * Gross Margin

Where NGR is the ratio of Net to gross Market value of the underlying trades in the portfolio.

I could not understand the logic of the formula (0.40 + 0.60 * NGR). I understand that the ratio for net to gross margin is assumed as a function of 60% of the ratio for net to gross market value due to consideration of future exposure. So that signifies 0.60 in above formula. However what is the significance of 0.40?

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