diff --git a/script/optics/ExitSlitYScan.py b/script/optics/ExitSlitYScan.py
index 60669231..aaf78d5c 100644
--- a/script/optics/ExitSlitYScan.py
+++ b/script/optics/ExitSlitYScan.py
@@ -25,5 +25,6 @@ def trig():
 
 #set_adc_averaging(dwelltime=DWELL)
 #set_exec_pars(compression=True, shuffle=True)
+set_exec_pars(compression=True)
 #lscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, LATENCY, before_read=trig, after_read=after_readout)
 cscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, time=TOTAL_TIME, after_read=after_readout, check_positions = False)