displaying x axes in multi panel graphs

[#1]

I've created a multipanel graph of two variables (SNA versus soil temperature) where I've divided the data in 4 classes based on another variable (soil moisture). The soil moisture data column was dragged into the "Wrap" area in Graph Builder. The journal editor I am would like to see x axes on the upper 2 panels.  Is there a way to display the full axes (tick marks and numbers) or just the tick marks to the inside of the graph area?  I can manipulate the display on the bottom of the graphs but not the top panels.  

[#2]

Would it work for you to use grid lines? You can double-click on either or both of the axes to edit and show/ hide major and minor grid lines.

[#3]

Hadn't thought of that. Thanks.