Please answer the given financial question based on the context.
Context: five-year performance comparison 2013 the following graph provides an indicator of cumulative total shareholder returns for the corporation as compared to the peer group index ( described above ) , the dj trans , and the s&p 500 . the graph assumes that $ 100 was invested in the common stock of union pacific corporation and each index on december 31 , 2010 and that all dividends were reinvested . the information below is historical in nature and is not necessarily indicative of future performance . purchases of equity securities 2013 during 2015 , we repurchased 36921641 shares of our common stock at an average price of $ 99.16 . the following table presents common stock repurchases during each month for the fourth quarter of 2015 : period total number of shares purchased [a] average price paid per share total number of shares purchased as part of a publicly announced plan or program [b] maximum number of shares remaining under the plan or program [b] .
|period|total number of shares purchased [a]|average price paid per share|total number of shares purchased as part of a publicly announcedplan or program [b]|maximum number of shares remaining under the plan or program [b]|
|oct . 1 through oct . 31|3247731|$ 92.98|3221153|56078192|
|nov . 1 through nov . 30|2325865|86.61|2322992|53755200|
|dec . 1 through dec . 31|1105389|77.63|1102754|52652446|
|total|6678985|$ 88.22|6646899|n/a|
[a] total number of shares purchased during the quarter includes approximately 32086 shares delivered or attested to upc by employees to pay stock option exercise prices , satisfy excess tax withholding obligations for stock option exercises or vesting of retention units , and pay withholding obligations for vesting of retention shares . [b] effective january 1 , 2014 , our board of directors authorized the repurchase of up to 120 million shares of our common stock by december 31 , 2017 . these repurchases may be made on the open market or through other transactions . our management has sole discretion with respect to determining the timing and amount of these transactions. .
Question: in the fourth quarter ended december 31 , 2015 what was the percent of the total number of shares purchased that was attributable to the employees to pay stock option exercise prices , satisfy excess tax withholding obligations
Answer:
0.0048