Question: In which division did this team, that was defeated by the Dallas Mavericks in 6 games in the 2011 National Basketball Association (NBA) finals, finish first in the regular season?

The 2011 NBA Finals was the championship series of the National Basketball Association (NBA)'s 2010–11 season, and the conclusion of the season's playoffs.  The Western Conference champion Dallas Mavericks defeated the Eastern Conference champion Miami Heat 4 games to 2 to win their first NBA championship.  Dallas became the last NBA team from Texas to win its first title, after the Houston Rockets won back-to-back titles in and , and the San Antonio Spurs won four NBA championships in , , and , and a fifth one subsequently in ; all three Texas NBA teams have now won at least one NBA championship.  It was also the first time in four years that the Los Angeles Lakers did not make the Finals, having been swept in the Western Conference semifinals by the eventual champion Dallas Mavericks. <SEP> The Miami Heat is an American professional basketball team based in Miami.  The team was launched in 1988 and played in the 1988–89 season of the National Basketball Association.  The next season they moved from the Western Conference to the Atlantic Division of the Eastern Conference.  After a mainly mediocre performance in the first few seasons, there were extensive team changes in 1995 and 1996 under head coach Pat Riley, including the recruitment of Isaac Austin and P.J. Brown.  They reached the Eastern Conference Finals for the first time in 1996–97.  They did not reach this level again until 2004–05, under new head coach Stan Van Gundy and with Dwyane Wade as a leading team member.  At this time they transferred to the Southeast Division.  The next year the team won the NBA Finals, defeating the Dallas Mavericks.  The head coach position was next taken by Erik Spoelstra.  Their next successful season was 2010–11, when they reached the NBA Finals again, losing to the Mavericks.  Acquiring LeBron James as a player, they won the Finals in both 2012 and 2013, and won 27 successive games in February–March 2013.  In 2013–14 they reached the Finals again but lost to San Antonio Spurs.  James left the team in July 2014, and the 2014–15 season was less successful. <SEP> The 2010–11 Dallas Mavericks season was the 31st season of the franchise in the National Basketball Association (NBA).  The Mavs playoff run came with a 6-game first round series against the Portland Trail Blazers, a series in which the Mavericks blew a 23-point lead in Game 4, but still won the series.  In the conference semi-finals, the Mavericks run was motivated with a sweep of the champions of the previous two seasons, the Los Angeles Lakers.  The series against the Lakers also became the birth of the Mavericks Royal Blue-Out games in the AAC, with almost all fans wearing T-shirts that read "The Time is Now".  In the Western Conference Finals against the Oklahoma City Thunder, the Mavericks won the last 3 games winning by 4th quarter comebacks, to win their second Western Conference Championship, and a trip to the NBA Finals for the first time since 2006, with a rematch against the Heat.  Following a disappointing Game 1, the Mavericks pulled the biggest comeback in NBA Finals history in Game 2 to even the series at 1 game each.  The Mavericks won the NBA Championship after defeating the Miami Heat in 6 games in the 2011 NBA Finals.  After a loss in Game 3, the Mavericks won the last two games in Dallas to take a 3–2 series lead heading to Game 6 in Miami.  The Mavericks won their first NBA Championship in Game 6 to clinch the first major sports championship in the Dallas-Fort Worth area since the Dallas Stars in 1999, and the first title in Mavericks franchise history.  The Mavericks are the third team to win an NBA title in the state of Texas, joining the Houston Rockets and San Antonio Spurs.  The Mavericks are also the third team to win a major sports championship in the Dallas-Fort Worth area, joining the Dallas Cowboys' five Super Bowl titles and the Dallas Stars' only Stanley Cup, leaving the Texas Rangers as the only team to not win a major sports title in the area, as they have not won the World Series.  The Mavericks championship parade was held on June 16, 2011 in downtown Dallas. <SEP>  In the regular season, the Heat finished first in the Southeast Division with 58–24 record, and made the NBA Playoffs for the 3rd consecutive year as the Eastern Conference's No. 2 seed (behind the Chicago Bulls). The 2010–11 Miami Heat season was the 3rd season of the Miami Heat in the National Basketball Association (NBA).