Act of 2010, but after any sequestration required by those sections, there shall be a sequestration equivalent to the estimated aggregate amount designated under section 6097 of the Internal Revenue Code of 1986 for the last taxable year ending 1 year before the beginning of that session of Congress, as estimated by the Department of the Treasury on October 1 and as modified by the total of— (1) any amounts by which net discretionary spending is reduced by an Act of Congress to be below the discretionary spending limits that is enacted after the date of enactment of this section and relate to the fiscal year subject to the sequestration (or, in the absence of such limits, any net deficit change from the baseline amount calculated under section 257)