How to show empty bins on my chart?

Hello, I have my data between -1 and 1 and I want to show a distribution graph. I would like that the X axis is always 20 bins of size 0.1. I tried to used the bin command, but whenever all the data lies between 0.1 and 0.2 for example, one single bin is displayed on the graph. I would like that empty bins are shown so that at a glance you can see if you are more distributed above 0 than below 0. Is this possible? Here is what I have tried: ... | bin FAVG_ERR_DOSE_PRIM start=-1.0 end=1.0 bins=20 span=0.1 | chart count(FIELD_ID) by FAVG_ERR_DOSE_PRIM See postimg.org/image/swm3z7ddd/ Thanks!