title: Remove lines between quad glyphs in Bokeh
body: <p>I am trying to create a 2D histogram with square bins (instead of hex elements) and I'm using quad to do so.</p>
  <p>First, I create a 2D histogram using numpy (not shown for brevity).</p>
  <p>Then I plot it using the quad glyph:</p>
  <pre><code>    def plotHist2D(self,name):
          &quot;&quot;&quot;
          Creates a 2D histogram figure in Bokeh.
  
          Parameters
          ----------
          name : string
              The name of one of the column data sources in self.files.
  
          Returns
          -------
          A bokeh plot object.
          &quot;&quot;&quot;
          cds = ColumnDataSource(self.makeHist2D(name))
          plot_cmap = linear_cmap('tops','Turbo256',0,1,)
          bar_cmap = LinearColorMapper(palette='Turbo256',low=0,high=1)
          p = figure(plot_height=350,plot_width=350,
                     title='kW/mm^2',                                                                                                     x_axis_label='x (m)',
                     y_axis_label='y (m)',
                     x_range=(-0.05,0.05),
                     y_range=(-0.05,0.05),
                     output_backend=&quot;webgl&quot;,
                     toolbar_location=&quot;above&quot;)
          p.quad(top='yrights',bottom='ylefts',left='xlefts',right='xrights',
                 fill_color=plot_cmap,line_color=plot_cmap,
                 line_width=0.1,line_alpha=1.0,
                 alpha=1.0,source=cds)
          color_bar = ColorBar(color_mapper=bar_cmap,width=8,
                               border_line_color=None,location=(0,0))
          p.add_layout(color_bar,'right')
          return p
  </code></pre>
  <p>This functions, in that it creates a figure, but the figure has unpleasant lines at the border between the quad elements.</p>
  <p><a href="https://i.stack.imgur.com/L3NFb.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/L3NFb.jpg" alt="Quad histogram" /></a></p>
  <p>I cannot find any combination of settings for the parameters line_width, line_color, and line_alpha that will get rid of these lines.  Is there any combination of settings that will eliminate those lines entirely?</p>
  <p>If not, how should I be creating this 2D histogram with square bins?</p>