Hi, if the dataset contains "null" values (that means gaps), there is an error: "dataset[i] is null" in line 135: arr[i] = dataset[i][1]; The dataset looks like this: [ [1324339200000,490], null, [1327795200000,870], [1327881600000,870], [1327968000000,871], null ] Flot recognizes these null values and interrupts automatically the chart line at these points, produces so called gaps. How can I use the multiple threshold plugin anyway? I already tried to set arr[i] to null @ line 135, but didn't work... any help?? Best regards and thanks in advance, Chris