How to Change Excel Chart Data Labels to Custom Values? May 05, 2010 · The Chart I have created (type thin line with tick markers) WILL NOT display x axis labels associated with more than 150 rows of data. (Noting 150/4=~ 38 labels initially chart ok, out of 1050/4=~ 263 total months labels in column A.) It does chart all 1050 rows of data values in Y at all times.