travel expenses, including per diem in lieu of subsistence, in accordance with applicable provisions under subchapter I of chapter 57 of title 5, United States Code. (5) Quorum Four members of the Oversight Panel shall constitute a quorum but a lesser number may hold hearings. (6) Vacancies A vacancy on the Oversight Panel shall be filled in the manner in which the original appointment was made. (7) Meetings The Oversight Panel shall meet at the call of the Chairperson or a majority of its members. (d) Staff (1) In general The Oversight Panel may appoint and fix the pay of any personnel as the Oversight Panel considers appropriate. (2) Experts and consultants The Oversight Panel may procure temporary and intermittent services under section 3109(b) of title 5, United States Code. (3) Staff of agencies Upon request of the Oversight Panel, the head of any Federal department or agency may detail, on a reimbursable basis, any of the personnel of that department or agency to the Oversight Panel to assist it in carrying out its duties under this Act. (e) Powers (1) Hearings and sessions The Oversight Panel may, for the purpose of carrying out this section, hold hearings, sit and act at times and places, take testimony, and receive evidence as the Panel considers appropriate and may administer oaths or affirmations to witnesses appearing before it. (2) Powers of members and agents Any member or agent of the Oversight Panel may, if authorized by the Oversight Panel, take any action which the Oversight Panel is authorized to take by this section. (3) Obtaining Official Data The Oversight Panel may secure directly from any department or agency of the United States information necessary to enable it to carry out this section. Upon request of the Chairperson of the Oversight Panel, the head of that department or agency shall furnish that information to the Oversight Panel. (4) Reports The Oversight Panel shall receive and consider all reports required to be submitted to the Oversight Panel under this Act. (f) Authorization