--- a/lib/flot/jquery.flot.fillbetween.js
+++ b/lib/flot/jquery.flot.fillbetween.js
@@ -1,1 +1,184 @@
+/*
+Flot plugin for computing bottoms for filled line and bar charts.
 
+The case: you've got two series that you want to fill the area
+between. In Flot terms, you need to use one as the fill bottom of the
+other. You can specify the bottom of each data point as the third
+coordinate manually, or you can use this plugin to compute it for you.
+
+In order to name the other series, you need to give it an id, like this
+
+  var dataset = [
+       { data: [ ... ], id: "foo" } ,         // use default bottom
+       { data: [ ... ], fillBetween: "foo" }, // use first dataset as bottom
+       ];
+
+  $.plot($("#placeholder"), dataset, { line: { show: true, fill: true }});
+
+As a convenience, if the id given is a number that doesn't appear as
+an id in the series, it is interpreted as the index in the array
+instead (so fillBetween: 0 can also mean the first series).
+  
+Internally, the plugin modifies the datapoints in each series. For
+line series, extra data points might be inserted through
+interpolation. Note that at points where the bottom line is not
+defined (due to a null point or start/end of line), the current line
+will show a gap too. The algorithm comes from the jquery.flot.stack.js
+plugin, possibly some code could be shared.
+*/
+
+(function ($) {
+    var options = {
+        series: { fillBetween: null } // or number
+    };
+    
+    function init(plot) {
+        function findBottomSeries(s, allseries) {
+            var i;
+            for (i = 0; i < allseries.length; ++i) {
+                if (allseries[i].id == s.fillBetween)
+                    return allseries[i];
+            }
+
+            if (typeof s.fillBetween == "number") {
+                i = s.fillBetween;
+            
+                if (i < 0 || i >= allseries.length)
+                    return null;
+
+                return allseries[i];
+            }
+            
+            return null;
+        }
+        
+        function computeFillBottoms(plot, s, datapoints) {
+            if (s.fillBetween == null)
+                return;
+
+            var other = findBottomSeries(s, plot.getData());
+            if (!other)
+                return;
+
+            var ps = datapoints.pointsize,
+                points = datapoints.points,
+                otherps = other.datapoints.pointsize,
+                otherpoints = other.datapoints.points,
+                newpoints = [],
+                px, py, intery, qx, qy, bottom,
+                withlines = s.lines.show,
+                withbottom = ps > 2 && datapoints.format[2].y,
+                withsteps = withlines && s.lines.steps,
+                fromgap = true,
+                i = 0, j = 0, l;
+
+            while (true) {
+                if (i >= points.length)
+                    break;
+
+                l = newpoints.length;
+
+                if (points[i] == null) {
+                    // copy gaps
+                    for (m = 0; m < ps; ++m)
+                        newpoints.push(points[i + m]);
+                    i += ps;
+                }
+                else if (j >= otherpoints.length) {
+                    // for lines, we can't use the rest of the points
+                    if (!withlines) {
+                        for (m = 0; m < ps; ++m)
+                            newpoints.push(points[i + m]);
+                    }
+                    i += ps;
+                }
+                else if (otherpoints[j] == null) {
+                    // oops, got a gap
+                    for (m = 0; m < ps; ++m)
+                        newpoints.push(null);
+                    fromgap = true;
+                    j += otherps;
+                }
+                else {
+                    // cases where we actually got two points
+                    px = points[i];
+                    py = points[i + 1];
+                    qx = otherpoints[j];
+                    qy = otherpoints[j + 1];
+                    bottom = 0;
+
+                    if (px == qx) {
+                        for (m = 0; m < ps; ++m)
+                            newpoints.push(points[i + m]);
+
+                        //newpoints[l + 1] += qy;
+                        bottom = qy;
+                        
+                        i += ps;
+                        j += otherps;
+                    }
+                    else if (px > qx) {
+                        // we got past point below, might need to
+                        // insert interpolated extra point
+                        if (withlines && i > 0 && points[i - ps] != null) {
+                            intery = py + (points[i - ps + 1] - py) * (qx - px) / (points[i - ps] - px);
+                            newpoints.push(qx);
+                            newpoints.push(intery)
+                            for (m = 2; m < ps; ++m)
+                                newpoints.push(points[i + m]);
+                            bottom = qy; 
+                        }
+
+                        j += otherps;
+                    }
+                    else { // px < qx
+                        if (fromgap && withlines) {
+                            // if we come from a gap, we just skip this point
+                            i += ps;
+                            continue;
+                        }
+                            
+                        for (m = 0; m < ps; ++m)
+                            newpoints.push(points[i + m]);
+                        
+                        // we might be able to interpolate a point below,
+                        // this can give us a better y
+                        if (withlines && j > 0 && otherpoints[j - otherps] != null)
+                            bottom = qy + (otherpoints[j - otherps + 1] - qy) * (px - qx) / (otherpoints[j - otherps] - qx);
+
+                        //newpoints[l + 1] += bottom;
+                        
+                        i += ps;
+                    }
+
+                    fromgap = false;
+                    
+                    if (l != newpoints.length && withbottom)
+                        newpoints[l + 2] = bottom;
+                }
+
+                // maintain the line steps invariant
+                if (withsteps && l != newpoints.length && l > 0
+                    && newpoints[l] != null
+                    && newpoints[l] != newpoints[l - ps]
+                    && newpoints[l + 1] != newpoints[l - ps + 1]) {
+                    for (m = 0; m < ps; ++m)
+                        newpoints[l + ps + m] = newpoints[l + m];
+                    newpoints[l + 1] = newpoints[l - ps + 1];
+                }
+            }
+
+            datapoints.points = newpoints;
+        }
+        
+        plot.hooks.processDatapoints.push(computeFillBottoms);
+    }
+    
+    $.plot.plugins.push({
+        init: init,
+        options: options,
+        name: 'fillbetween',
+        version: '1.0'
+    });
+})(jQuery);
+