head += '<div style="margin-right: 10px;" data-netdata="system.io"'
                + ' data-dimensions="in"'
                + ' data-chart-library="easypiechart"'
                + ' data-title="Disk Read"'
                + ' data-width="10%"'
                + ' data-before="0"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' role="application"></div>';

                head += '<div style="margin-right: 10px;" data-netdata="system.io"'
                + ' data-dimensions="out"'
                + ' data-chart-library="easypiechart"'
                + ' data-title="Disk Write"'
                + ' data-width="10%"'
                + ' data-before="0"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' role="application"></div>';
            }

            if(typeof charts['system.cpu'] !== 'undefined')
                head += '<div data-netdata="system.cpu"'
                + ' data-chart-library="gauge"'
                + ' data-title="CPU"'
                + ' data-units="%"'
                + ' data-gauge-max-value="100"'
                + ' data-width="18%"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' data-colors="' + NETDATA.colors[12] + '"'
                + ' role="application"></div>';

            if(typeof charts['system.ipv4'] !== 'undefined') {
                head += '<div style="margin-right: 10px;" data-netdata="system.ipv4"'
                + ' data-dimensions="received"'
                + ' data-chart-library="easypiechart"'
                + ' data-title="IPv4 Inbound"'
                + ' data-width="10%"'
                + ' data-before="0"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' role="application"></div>';

                head += '<div style="margin-right: 10px;" data-netdata="system.ipv4"'
                + ' data-dimensions="sent"'
                + ' data-chart-library="easypiechart"'
                + ' data-title="IPv4 Outbound"'
                + ' data-width="10%"'
                + ' data-before="0"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' role="application"></div>';
            }
            else if(typeof charts['system.ipv6'] !== 'undefined') {
                head += '<div style="margin-right: 10px;" data-netdata="system.ipv6"'
                + ' data-dimensions="received"'
                + ' data-chart-library="easypiechart"'
                + ' data-title="IPv6 Inbound"'
                + ' data-units="kbps"'
                + ' data-width="10%"'
                + ' data-before="0"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' role="application"></div>';

                head += '<div style="margin-right: 10px;" data-netdata="system.ipv6"'
                + ' data-dimensions="sent"'
                + ' data-chart-library="easypiechart"'
                + ' data-title="IPv6 Outbound"'
                + ' data-units="kbps"'
                + ' data-width="10%"'
                + ' data-before="0"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' role="application"></div>';
            }

            if(typeof charts['system.ram'] !== 'undefined')
                head += '<div style="margin-right: 10px;" data-netdata="system.ram"'
                + ' data-dimensions="used|buffers|active|wired"' // active and wired are FreeBSD stats
                + ' data-append-options="percentage"'
                + ' data-chart-library="easypiechart"'
                + ' data-title="Used RAM"'
                + ' data-units="%"'
                + ' data-easypiechart-max-value="100"'
                + ' data-width="8%"'
                + ' data-after="-' + duration.toString() + '"'
                + ' data-points="' + duration.toString() + '"'
                + ' data-colors="' + NETDATA.colors[7] + '"'
                + ' role="application"></div>';