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#X text 32 12 pdp_cog: compute intensity \, center of gravity and standard
deviation. (interpret an image as a gaussian blob).;
#X text 201 215 standard deviation x;
#X text 200 239 standard deviation y;
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;
#X obj 21 236 pdp_help_output;
#X obj 78 73 pdp_help_input;
#X text 200 141 average intensity;
#X text 200 168 center of gravity x;
#X text 200 190 center of gravity y;
#X text 203 47 creation argument is threshold;
#X obj 78 124 pdp_cog;
#X floatatom 375 291 5 0 0;
#X obj 226 317 pdp_cog_abs_thresh 0.1;
#X text 87 342 the same \, but takes the absolute value and performs
a thresholding operation;
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