im sorry in advance for exceedingly stupid question but for some reason i cant wrap my head around this concept. when looking at this graph, which bonds have a higher volatility? i said the GS1 bonds at first, but googling this has confused me even further. the GS1(1 year treasury) bonds have a standard deviation of 1.611% and the GS20 (20 year treasury) bonds have a standard deviation of 1.051%

Rate 0.00 1.00 2.00 3.00 4.00 5.00 6.00 2005-01-01 2005-10-01 2006-07-01 2007-04-01 2008-01-01 2008-10-01 GS1 2009-07-01 2010-04-01 2011-01-01 2011-10-01 2012-07-01 1 year VS 20 year Treasury Date 2013-04-01 GS20 2014-01-01 2014-10-01 2015-07-01 2016-04-01 2017-01-01 2017-10-01 2018-07-01 2019-04-01 2020-01-01