public function provideHistogram()
{
return [[[10, 10, 2, 2], 10, null, null, [2 => 2, '2.8' => 0, '3.6' => 0, '4.4' => 0, '5.2' => 0, '6' => 0, '6.8' => 0, '7.6' => 0, '8.4' => 0, '9.2' => 0, 10 => 2]], [[1, 10, 2, 2, 2, 3, 2, 4], 9, null, null, [1 => 1, 2 => 4, 3 => 1, 4 => 1, 5 => 0, 6 => 0, 7 => 0, 8 => 0, 9 => 0, 10 => 1]], [[-3, -2, -1, 0, 1, 2, 3], 10, -3, 3, [-3 => 1, '-2.4' => 1, '-1.8' => 0, '-1.2' => 1, '-0.6' => 1, '2.2204460492503E-16' => 0, '0.6' => 1, '1.2' => 0, '1.8' => 1, '2.4' => 1, 3 => 0]]];
}