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Date: Fri, 03 Oct 1997 10:46:02 -0400
From: Larry David <lpd@head-cfa.harvard.edu>
Status: R
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------- Forwarded Message

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From: zhao@beida (Ping Zhao)
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                HRMA On-orbit On-axis Effective Area
                        Coating: 97.25% bulk Ir
  Energy     Shell 1     Shell 3     Shell 4     Shell 6       HRMA
  (keV)       (cm2)       (cm2)       (cm2)       (cm2)        (cm2)
- ---------------------------------------------------------------------
- ---------------------------------------------------------------------


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From lpd@cfa271.harvard.edu Fri Oct  3 10:46:10 1997
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Date: Fri, 3 Oct 1997 10:45:48 -0400
From: lpd@cfa271.harvard.edu (Larry David)
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To: dd@cfa271.harvard.edu
Subject: HRMA effective area
Status: R
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Hi Dan,

I'm forwarding the latest calculations
of the HRMA effective area to you in the next
email.  These are the same numbers used in the SIN and
are based on raytrace simulations by Ping Zhao.
Note - the simulated effective areas still disagree
with XRCF measurements at the 10% level.  Below 2keV
Henke coefficients are used, while above 2 keV 
synchrotron measurements are used to determine the
optical coeficients.

Larry