File:SparqlCharts NVD3 Multi-Line Chart with focus.png

Screenshot taken from nvd3.org, showing the "line chart with view finder" format, that could be implemented in the SparqlCharts extension. This format makes use of D3.js and NVD3. D3.js is a JavaScript library distributed under the BSD 3-Clause License. NVD3 provides re-usable charts and chart components for D3.js and is distributed under the Apache License, Version 2.0, see here.