Question: How much did Jackson Pollock's piece "Blue Poles: Number 11, 1952" sell for at auction in 1973?
About the article "Jackson Pollock", section "At auction".

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Art market.
At auction.
In 1973, Blue Poles "(Blue Poles: Number 11, 1952)," was purchased by the Australian Whitlam Government for the National Gallery of Australia for US $2 million (A$1.3 million at the time of payment).
At the time, this was the highest price ever paid for a modern painting.
The painting is now one of the most popular exhibits in the gallery.
It was a centerpiece of the Museum of Modern Art's 1998 retrospective in New York, the first time the painting had been shown in America since its purchase.
In November 2006, Pollock's "No.
5, 1948" became the world's most expensive painting, when it was sold privately to an undisclosed buyer for the sum of $140,000,000.
Another artist record was established in 2004, when "No.
12" (1949), a medium-sized drip painting that had been shown in the United States Pavilion at the 1950 Venice Biennale, fetched $11.7 million at Christie's, New York.
In 2012, "Number 28, 1951," one of the artist’s combinations of drip and brushwork in shades of silvery gray with red, yellow and shots of blue and white, also sold at Christie's, New York, for $20.5 million—$23 million with fees—within its estimated range of $20 million to $30 million.
In 2013 Pollock's "Number 19" (1948) was sold by Christies for a reported $58,363,750 during an auction that ultimately reached $495 million total sales in one night which Christies reports as a record to date as the most expensive auction of contemporary art.
Number 11, 1952, also known as Blue Poles, is an abstract expressionist painting and one of the most famous works by American artist Jackson Pollock.
It was purchased amid controversy by the National Gallery of Australia in 1973 and today remains one of the gallery's major paintings. 
On 3 February 2010, edition number two of the sculpture came up for auction at Sotheby's auction house in London.
The piece was sold by German banking group Commerzbank, which had acquired it when it took over the Dresdner Bank in 2009.
The sale of the sculpture marked the first time in 20 years that a life-size Giacometti figure of a walking man came to auction.
It had been estimated to sell for between £12 and £18 million, but in just eight minutes the sculpture was bought by Lily Safra, widow of the prominent Lebanese banker Edmond Safra for £58 million.
Including the buyer's premium the price reached £65 million (US$103.7 million).
The piece broke the record for a Giacometti work at auction, which was set at $27.5 million by "Grande Femme Debout II" in 2008, and that for the most expensive sculpture sold at a public auction, which was held by the 5000-year-old Guennol Lioness, sold at Sotheby's in 2007 for $57.2 m. When expressed in British pounds and when inflation is ignored, the bronze also broke the record price for an art work sold at auction which, since 2004, was held at $104.2 million (then £58.2 m) by Pablo Picasso's "Garçon à la pipe".
The most expensive work of art sold at a public auction remained Van Gogh's "Portrait of Dr. Gachet", which was bought in May 1990 for $82.5 million (approx.
$138.4 million in CPI-adjusted 2010 US dollars), while Jackson Pollock's "No.
5, 1948", which was privately sold for $140 million in 2006 (approx.
$151 million in 2010 dollars), remained the most expensive work of art sold overall. 
At the time of the painting's creation, Pollock preferred not to assign names to his works, but rather numbers; as such, the original title of "Blue Poles" was simply "Number 11"' or "No.
11" for the year 1952.
In 1954, the new title "Blue Poles" was first seen at an exhibition at the Sidney Janis Gallery and reportedly originated from Pollock himself.
According to art historian Dennis Phillips, the specific rather than ambiguous title "limits our field of comprehension and does the painting a singular disservice.
Because we look for the poles and miss much of the rest, the name is simply too distracting."
In 1955, Pollock painted "Scent" and "Search," his last two paintings.
He did not paint at all in 1956, but was making sculptures at Tony Smith’s home: constructions of wire, gauze, and plaster.
Shaped by sand-casting, they have heavily textured surfaces similar to what Pollock often created in his paintings.
On August 11, 1956, at 10:15 pm, Pollock died in a single-car crash in his Oldsmobile convertible while driving under the influence of alcohol.
One of the passengers, Edith Metzger, was also killed in the accident, which occurred less than a mile from Pollock's home.
The other passenger, Ruth Kligman, an artist and Pollock's mistress, survived.
For the rest of her life, his widow Lee Krasner managed his estate and ensured that Pollock's reputation remained strong despite changing art-world trends.
The couple are buried in Green River Cemetery in Springs with a large boulder marking his grave and a smaller one marking hers.