diff --git a/pdb-js/src/assets/img/histogram.svg b/pdb-js/src/assets/img/histogram.svg
index 2d96543..a4e5d2e 100644
--- a/pdb-js/src/assets/img/histogram.svg
+++ b/pdb-js/src/assets/img/histogram.svg
@@ -1,491 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   xmlns:dc="http://purl.org/dc/elements/1.1/"
-   xmlns:cc="http://creativecommons.org/ns#"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   width="64"
-   height="64"
-   shape-rendering="geometricPrecision"
-   text-rendering="geometricPrecision"
-   image-rendering="optimizeQuality"
-   fill-rule="evenodd"
-   clip-rule="evenodd"
-   viewBox="0 0 640 640"
-   version="1.1"
-   id="svg4"
-   sodipodi:docname="histogram.svg"
-   inkscape:version="0.92.3 (2405546, 2018-03-11)">
-  <metadata
-     id="metadata10">
-    <rdf:RDF>
-      <cc:Work
-         rdf:about="">
-        <dc:format>image/svg+xml</dc:format>
-        <dc:type
-           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title></dc:title>
-      </cc:Work>
-    </rdf:RDF>
-  </metadata>
-  <defs
-     id="defs8">
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5303"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5299"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5295"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5291"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5241"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5237"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5140"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5136"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5132"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect4918"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect4895"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect4872"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect4868"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect4864"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect4731"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect3922"
-       is_visible="true"
-       weight="33.3333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect3918"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect3914"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bend_path"
-       id="path-effect205"
-       is_visible="true"
-       bendpath="M 0,0 H 1"
-       prop_scale="1.0426743"
-       scale_y_rel="true"
-       vertical="false"
-       bendpath-nodetypes="cc" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect4918-3"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5136-6"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5140-0"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5136-61"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5140-8"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5136-2"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5140-02"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5136-5"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5140-9"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5303-9"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5299-7"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5303-1"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5299-2"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5303-19"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5299-4"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5303-4"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-    <inkscape:path-effect
-       effect="bspline"
-       id="path-effect5299-5"
-       is_visible="true"
-       weight="33.333333"
-       steps="2"
-       helper_size="0"
-       apply_no_weight="true"
-       apply_with_weight="true"
-       only_selected="false" />
-  </defs>
-  <sodipodi:namedview
-     pagecolor="#ffffff"
-     bordercolor="#666666"
-     borderopacity="1"
-     objecttolerance="10"
-     gridtolerance="10"
-     guidetolerance="10"
-     inkscape:pageopacity="0"
-     inkscape:pageshadow="2"
-     inkscape:window-width="1533"
-     inkscape:window-height="1145"
-     id="namedview6"
-     showgrid="true"
-     inkscape:snap-grids="true"
-     inkscape:zoom="14.75"
-     inkscape:cx="31.243745"
-     inkscape:cy="34.779661"
-     inkscape:window-x="67"
-     inkscape:window-y="27"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="svg4"
-     inkscape:snap-to-guides="false"
-     inkscape:snap-global="true">
-    <inkscape:grid
-       type="xygrid"
-       id="grid3910" />
-  </sodipodi:namedview>
-  <path
-     style="fill:#9400d3;stroke-width:6.5;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;fill-opacity:0"
-     d="m 43.72308,28.757127 c 0.282929,-0.521415 5.177783,-8.662034 5.207841,-8.661149 0.01984,5.84e-4 1.278626,1.930246 2.797293,4.288136 l 2.761213,4.287072 -0.727315,0.04249 c -0.400023,0.02337 -2.40528,0.06184 -4.456128,0.08548 -2.050847,0.02364 -4.166544,0.06175 -4.701548,0.08468 L 43.6317,28.92553 Z"
-     id="path4801"
-     inkscape:connector-curvature="0"
-     transform="scale(10)" />
-  <path
-     style="fill:#9400d3;fill-opacity:0;stroke-width:6.5;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none"
-     d="m 11.170391,48.874963 c 0,-0.11777 5.07961,-8.576658 5.150332,-8.576658 0.136168,0 5.561825,8.36129 5.479243,8.443871 -0.08038,0.08038 -10.629575,0.21216 -10.629575,0.132787 z"
-     id="path4803"
-     inkscape:connector-curvature="0"
-     transform="scale(10)" />
-  <path
-     style="fill:#9400d3;fill-opacity:0;stroke-width:6.5;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none"
-     d="m 11.170391,48.874963 c 0,-0.11777 5.07961,-8.576658 5.150332,-8.576658 0.136168,0 5.561825,8.36129 5.479243,8.443871 -0.08038,0.08038 -10.629575,0.21216 -10.629575,0.132787 z"
-     id="path4805"
-     inkscape:connector-curvature="0"
-     transform="scale(10)" />
-  <rect
-     style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:30.00000191;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="rect5590"
-     width="70"
-     height="100"
-     x="0"
-     y="440" />
-  <rect
-     style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:30.00000191;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="rect5592"
-     width="70"
-     height="190"
-     x="90"
-     y="350" />
-  <rect
-     style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:29.99999809;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="rect5594"
-     width="70.847458"
-     height="400"
-     x="180"
-     y="139.99998"
-     ry="0" />
-  <rect
-     style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:30.00000191;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="rect5596"
-     width="70"
-     height="500"
-     x="270"
-     y="40" />
-  <rect
-     style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:30.00000191;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="rect5598"
-     width="70"
-     height="400"
-     x="360"
-     y="140" />
-  <rect
-     style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:30.00000191;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="rect5600"
-     width="70"
-     height="250"
-     x="450"
-     y="290" />
-  <rect
-     style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:30.00000191;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="rect5592-4"
-     width="70"
-     height="150"
-     x="540"
-     y="390" />
+<svg xmlns="http://www.w3.org/2000/svg" width="640" height="640" viewBox="0 0 640 640" version="1.1">
+<rect width="70" height="100" x="0" y="440"/>
+<rect width="70" height="190" x="90" y="350"/>
+<rect width="70" height="400" x="180" y="139"/>
+<rect width="70" height="500" x="270" y="40"/>
+<rect width="70" height="400" x="360" y="140"/>
+<rect width="70" height="250" x="450" y="290"/>
+<rect width="70" height="150" x="540" y="390"/>
 </svg>