Exhibit 99.(A)(1)(F)

            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9

Guidelines for Determining the Proper Identification Number to Give the Payor.

     Social security numbers have nine digits separated by two hyphens: e.g.
000-00-0000. Employer identification numbers have nine digits separated by
only one hyphen: e.g. 00-0000000. The table below will help determine the
number to give the payor.



- ---------------------------------------------
                             Give the
For this type of account:    SOCIAL SECURITY
                             number of--
- ---------------------------------------------
                          
 1. An individual's account  The individual
 2. Two or more individuals  The actual owner
    (joint account)          of the account
                             or, if combined
                             funds, the first
                             individual on
                             the account(1)
 3. Husband and wife (joint  The actual owner
    account)                 of the account
                             or, if joint
                             funds, either
                             person(1)
 4. Custodian account of a   The minor(2)
    minor (Uniform Gift to
    Minors Act)
 5. Adult and minor (joint   The adult or, if
    account)                 the minor is the
                             only contributor,
                             the minor(1)
 6. Account in the name of   The ward, minor,
    guardian or committee    or incompetent
    for a designated ward,   person(3)
    minor, or incompetent
    person
 7. a. A revocable savings   The grantor-
       trust account (in     trustee(1)
       which grantor is
       also trustee)
    b. Any "trust" account   The actual
       that is not a legal   owner(1)
       or valid trust under
       State law
- ---------------------------------------------



- ---------------------------------------------
                             Give the EMPLOYER
For this type of account:    IDENTIFICATION
                             number of--
- ---------------------------------------------
                          
 8. Sole proprietorship      The owner(4)
    account
 9. A valid trust, estate,   The legal entity
    or pension trust         (do not furnish
                             the identifying
                             number of the
                             personal
                             representative
                             or trustee
                             unless the legal
                             entity itself is
                             not designated
                             in the account
                             title.)(5)
10. Corporate account        The corporation
11. Religious, charitable,   The organization
    or educational
    organization account
12. Partnership account      The partnership
    held in the name of
    the business
13. Association, club, or    The organization
    other tax-exempt
    organization
14. A broker or registered   The broker or
    nominee                  nominee
15. Account with the         The public
    Department of            entity
    Agriculture in the
    name of a public
    entity (such as a
    State or local
    government, school
    district, or prison)
    that receives
    agricultural program
    payments
- ---------------------------------------------


(1) List first and circle the name of the person whose number you furnish.
(2) Circle the minor's name and furnish the minor's social security number.
(3) Circle the ward's, minor's or incompetent person's name and furnish such
    person's social security number.
(4) Show the name of the owner. If the owner does not have an employer
    identification number, furnish the owner's social security number.
(5) List first and circle the name of the legal trust, estate or pension
    trust.

NOTE: IF NO NAME IS CIRCLED WHEN THERE IS MORE THAN ONE NAME, THE NUMBER WILL
      BE CONSIDERED TO BE THAT OF THE FIRST NAME LISTED.

                                       1


            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER OF SUBSTITUTE FORM W-9
                                     Page 2

Obtaining a Number

  If you do not have a taxpayer identification number or you do not know your
number, obtain form SS-5, Application for a Social Security Number Card (for
resident individuals), Form SS-4, Application for Employer Identification
Number (for businesses and all other entities), Form W-7 for International
Taxpayer Identification Number (for alien individuals required to file U.S. tax
returns), at an office of the Social Security Administration or the Internal
Revenue Service.

  To complete the Substitute Form W-9, if you do not have a taxpayer
identification number, write "Applied For" in the space for the taxpayer
identification number in Part 1, sign and date the Form, and give it to the
requester. Generally, you will then have 60 days to obtain a taxpayer
identification number and furnish it to the requester. Notwithstanding that you
follow these procedures, the Payor will withhold (at the Withholding Rate) on
all payments made prior to the time a properly certified TIN is provided to the
Payor within 60 days.

Payees Exempt from Backup Withholding Penalties

  Payees specifically exempted from backup withholding on All payments included
the following:

 . A corporation.
 . A financial institution.
 . An organization exempt from tax under section 501(a), or an individual
   retirement plan, or a custodian account under Section 403(b)(7).
 . The United States or any agency or instrumentality thereof.
 . A State, the District of Columbia, a possession of the United States, or
   any subdivision or instrumentality thereof.
 . A foreign government, a political subdivision of a foreign government, or
   any agency or instrumentality thereof.
 . An international organization or any agency, or instrumentality thereof.
 . A registered dealer in securities or commodities registered in the United
   States or a possession of the United States.
 . A real estate investment trust.
 . A common trust fund operated by a bank under section 584(a).
 . An entity registered at all times under the Investment Company Act of 1940.
 . A foreign central bank of issue.

- -------
  *Unless otherwise noted herein, all references below to section numbers or to
regulations are references to the Internal Revenue Code and the regulations
promulgated thereunder.

Certain exempt payees described above should file a Substitute Form W- 9 to
avoid possible erroneous backup withholding. (See Instruction 11 above). FILE
THIS FORM WITH THE PAYOR, FURNISH YOUR TAXPAYER IDENTIFICATION NUMBER, WRITE
"EXEMPT" IN PART 2, SIGN AND DATE THE FORM AND RETURN IT TO THE PAYOR.

Certain payments other than interest, dividends, and patronage dividends that
are not subject to information reporting are also not subject to backup
withholding. For details, see the sections 6041, 6041A(a), 6042, 6044, 6045,
6049, 6050A and 6050N and the regulations thereunder.

  Privacy Act Notice.--Section 6109 requires most recipients of dividend,
interest, or other payments to give taxpayer identification numbers to payers
who must report the payments to IRS. IRS uses the numbers for identification
purposes and to help verify the accuracy of tax reforms. Payers must be given
the numbers whether or not recipients are required to file tax returns. Payers
must generally withhold at the Withholding Rate of taxable interest, dividend,
and certain other payments to a payee who does not furnish a taxpayer
identification number to a payer. Certain penalties may also apply.

Penalties

  (1) Penalty for Failure to Furnish Taxpayer Identification Number.--If you
fail to furnish your correct taxpayer identification number to a payer, you are
subject to a penalty of $50 for each such failure unless your failure is due to
reasonable cause and not to willful neglect.
  (2) Civil Penalty for False Statements With Respect to Withholding.--If you
make a false statement with no reasonable basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.
  (3) Criminal Penalty for Falsifying Information.--If you willfully falsify
certifications or affirmations, you may be subject to criminal penalties
including fines and/or imprisonment.

FOR ADDITIONAL INFORMATION CONTACT YOUR TAX CONSULTANT OR THE INTERNAL REVENUE
SERVICE.