diff --git a/xray/azav.py b/xray/azav.py
index 515cea4..5ca360e 100644
--- a/xray/azav.py
+++ b/xray/azav.py
@@ -274,7 +274,7 @@ def doFolder(folder,files='*.edf*',nQ = 1500,force=False,mask=None,dark=10,norm=
       err[ifname]  = e
       if saveChi:
         chi_fname = utils.removeExt(fname) + ".chi"
-        utils.saveTxt(chi_fname,q,i,e,info=ai_as_str(ai),overwrite=True)
+        utils.saveTxt(chi_fname,q,np.vstack((i,e)),info=ai_as_str(ai),overwrite=True)
 
     files = [ utils.getBasename(f) for f in files ]
     files = np.asarray(files)