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    <p>There is no <code>14</code> and there are two <code>8</code>s on the x-axis. This is because the <code>bins</code> function will diligently divide the range <code>= 14 - 1 = 13</code> into <code>14</code> intervals <a href="https://github.com/mbostock/d3/wiki/Histogram-Layout#wiki-bins" rel="nofollow">as per the API reference</a>:</p> <blockquote> <p>The bins may be specified as a number, in which case the range of values will be split uniformly into the given number of bins. Or, bins may be an array of threshold values, defining the bins; the specified array must contain the rightmost (upper) value, thus specifying n + 1 values for n bins. ...</p> </blockquote> <p>Before solving this issue, I am guessing that the second problem you are facing is that if the <code>rangeDefault</code> has negative values, then some values are not plotted. To fix that problem, being unaware of the exact need of it, I will start by removing the following:</p> <pre class="lang-js prettyprint-override"><code>rangeDefault[0] = 0; //All histograms start from 0 &lt;-- REMOVED </code></pre> <p>Then to fix the first problem, use the second form of arguments for <code>bins</code><a href="http://jsfiddle.net/xjMNr/" rel="nofollow">as shown here</a>:</p> <pre class="lang-js prettyprint-override"><code> var bins = []; for(var ii = settings.range[0], jj = 0; ii &lt;= settings.range[1] + 1; ii++, jj++) bins[jj] = ii; var data = d3.layout.histogram() .bins(bins)(settings.data); </code></pre> <p>I hope this addresses the primary queries.</p> <hr> <p>Adding the light grey indicator lines is fairly easy, <a href="http://jsfiddle.net/EXfCu/1/" rel="nofollow">as shown here</a>. The changes were:</p> <h1>vis.css</h1> <pre><code>.y.axis line.tick { opacity: .3; } </code></pre> <h1>vis.js</h1> <p>Moving the axis before the chart in the DOM because of how SVG is laid out affects its <code>z-index</code>:</p> <pre class="lang-js prettyprint-override"><code>var gEnter = svg.enter().append("svg").append("g"); gEnter.append("g").attr("class", "x axis"); gEnter.append("g").attr("class","y axis"); gEnter.append("g").attr("class", "bars"); </code></pre> <p>And finally making the major <code>tickSize</code> on the y-axis <code>-(width - margin.right - margin.left)</code>:</p> <pre class="lang-js prettyprint-override"><code>yAxis = d3.svg.axis() .scale(y) .orient("left") .tickSubdivide(true) .tickPadding(5) .ticks(10) .tickSize(-(width - margin.right - margin.left), 2, 8); </code></pre>
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    1. COThat looks good, I think http://jsfiddle.net/EXfCu/ is the fiddle for the indicator lines(you might just have missed adding the correct link). Also, the indicator lines tend to "overflow" when put on with the x-axis. Any thoughts about how to contain them?
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    2. COSorry about the link, I have corrected that in the answer. Also, I have fixed the overflowing of the indicator lines, the problem was that I had forgotten to adjust for margins around the graph.
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