[ccp4bb]: mapmask and npo

["Gregory D. Bowman" <gdbowman@phoenix.Princeton.EDU>]

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Hello,

I have a crystal with spacegroup P4212 and am having trouble  plotting the
Harker section w=0.0. I use FFT to get a patterson map and then MAPMASK to
section the map, and NPO to plot (essentially following the toxd 
MIR.exams).  I am able to get Harker sections for u=0.5 and v=0.5, but
something goes wrong when I set 
XYZLIM  0.0 0.5   0.0 0.5   0.0 0.0

I am also unclear on the "AXIS <fast> <med> <slow>/X Y Z" and how this is
related to SECTNS in NPO.

Thanks for any advice!

-Greg


Here is the script I am using:
#========================================================

mapmask mapin Pt1_14b2_patt mapout Pt1_14b2_patt_1X << END 
AXIS Z Y X
XYZLIM 0.5 0.5 0.0 0.5 0.0 0.5 
END

npo \
MAPIN Pt1_14b2_patt_1X.map \
PLOT Pt1_14b2_patt1X.plot \
<< END-npo
TITLE 15.0 - 3.5 ISO Patt X Harker
# Contour map
MAP SCALE 3
CONTRS SIG 1.0 1.5 2.0 2.5
SECTNS 8 8 1
grid 0.05 0.05
# Plot out
PLOT
END-npo
#=========================================================

mapmask mapin Pt1_14b2_patt mapout Pt1_14b2_patt_1Y << END
AXIS X Z Y
XYZLIM 0.0 0.5 0.5 0.5 0.0 0.5
END

npo \
MAPIN Pt1_14b2_patt_1Y.map \
PLOT Pt1_14b2_patt1Y.plot \
<< END-npo
TITLE 15.0 - 3.5 ISO Patt Y Harker
# Contour map
MAP SCALE 3
CONTRS SIG 1.0 1.5 2.0 2.5
SECTNS 16 16 1
grid 0.05 0.05
# Plot out
PLOT
END-npo
#==========================================================

mapmask mapin Pt1_14b2_patt mapout Pt1_14b2_patt_1Z << END 
AXIS Y X Z
XYZLIM 0.0 0.5 0.0 0.5 0.0 0.0
END

npo \
MAPIN Pt1_14b2_patt_1Z.map \
PLOT Pt1_14b2_patt1Z.plot \
<< END-npo
TITLE 15.0 - 3.5 ISO Patt Z Harker
# Contour map
MAP SCALE 3
CONTRS SIG 1.0 1.5 2.0 2.5
SECTNS 8 8 1
grid 0.05 0.05
# Plot out
PLOT
END-npo






PLOT 

mapmask mapin Pt1_14b2_patt mapout Pt1_14b2_patt_1Z << END AXIS Y X Z
XYZLIM 0.0 0.5 0.0 0.5 0.0 0.0 END