EXHIBIT 4.6 AMENDMENT NO. 1 TO FIRST AMENDED AND RESTATED RIGHTS AGREEMENT THIS AMENDMENT NO. 1 TO FIRST AMENDED AND RESTATED RIGHTS AGREEMENT (this "Amendment"), dated as of April 14, 2004, is between Tom Brown, Inc., a Delaware corporation (the...Rights Agreement • April 20th, 2004 • Brown Tom Inc /De • Crude petroleum & natural gas • Delaware
