format: function(orig) { // format data for normalization 
            // console.log(orig);
            val = orig.replace(/ns/,'');
            if (val != orig) { return val / (1000*1000*1000); } 
            val = orig.replace(/µs/,''); /* XXX use µ ? */
            if (val != orig) { return val / (1000*1000); } 
            var val = orig.replace(/ms/,'');
            if (val != orig) { return val / (1000); }
            var val = orig.replace(/s/,'');  ######## <<<<<<<<<<<<<<
            if (val != orig) { return val; }
            if (orig == '0') { return orig; } 
            console.log('no match for fmt_time of '.concat(orig));
            return orig;
        },