Round[Range[-11, 11], 2]
{-12,-10,-8,-8,-8,-6,-4,-4,-4,-2,0,0,0,2,4,4,4,6,8,8,8,10,12}
Histogram[#, ChartLegends -> "Hello World"] & /@ RandomReal[1, {4, 100}] // GraphicsColumn
GraphicsColumn
Column
Histogram[#, ChartLegends -> "Hello World"] & /@ RandomReal[1, {4, 100}] // Column // Export["~/Desktop/foo.pdf", #] &