Eric- thanks for the prompt response and suggestions. i did however already consider all of the settings you suggested might be the problem. outver was set to 1, all output file name parameters were set, and allokay was set to 2. if you would't mind looking over my parameter settings, i would really appreciate it. here are my imagr settings on my initial boxclean that i use to create the uv work file: AIPS 1: IMAGR: Wide field imaging/Clean task AIPS 1: Adverbs Values Comments AIPS 1: ---------------------------------------------------------------- AIPS 1: INNAME '0723+384 ' Input UV data (name) AIPS 1: INCLASS 'DOSORT' Input UV data (class) AIPS 1: INSEQ 1 Input UV data (seq. #) AIPS 1: INDISK 1 Input UV data disk drive # AIPS 1: SOURCES *all ' ' Source name AIPS 1: QUAL -1 Calibrator qualifier -1=>all AIPS 1: CALCODE ' ' Calibrator code ' '=>all AIPS 1: TIMERANG *all 0 Time range to use AIPS 1: SELBAND -1 Bandwidth to select (kHz) AIPS 1: SELFREQ -1 Frequency to select (MHz) AIPS 1: FREQID -1 Freq. ID to select. AIPS 1: SUBARRAY 0 Sub-array, 0=>all AIPS 1: DOCALIB -1 If >0 calibrate data AIPS 1: = 2 calibrate weights AIPS 1: GAINUSE 0 CL (or SN) table to apply AIPS 1: DOPOL -1 If >0.5 correct polarization. AIPS 1: BLVER -1 BL table to apply. AIPS 1: FLAGVER 0 Flag table version AIPS 1: DOBAND -1 If >0.5 apply bandpass cal. AIPS 1: Method used depends on value AIPS 1: of DOBAND (see HELP file). AIPS 1: BPVER -1 Bandpass table version AIPS 1: SMOOTH *all 0 Smoothing function. See AIPS 1: HELP SMOOTH for details. AIPS 1: STOKES ' ' Stokes parameters (see HELP) AIPS 1: BCHAN 1 Low freq. channel 0 for cont. AIPS 1: ECHAN 0 Highest freq channel AIPS 1: CHANNEL 0 Restart channel number AIPS 1: NPOINTS 1 Number of chan. to average. AIPS 1: CHINC 1 Channel incr. between maps. AIPS 1: BIF 0 First IF in average. AIPS 1: EIF 0 Last IF in average. AIPS 1: OUTNAME 'TEST 723+384' Output image name (name) AIPS 1: OUTDISK 0 Output image disk drive # AIPS 1: OUTSEQ 0 Output seq. no. AIPS 1: OUTVER 0 CC ver. no (Continuum only) AIPS 1: *** SET OUTVER ON RESTARTS AIPS 1: IN2NAME '0723+384 ' UV work file name AIPS 1: IN2CLASS 'UVWORK' UV work file class AIPS 1: IN2SEQ 1 UV work file seq AIPS 1: *** SET TO KEEP WORK FILE AIPS 1: IN2DISK 1 UV work file disk AIPS 1: CELLSIZE 0.2 0.2 (X,Y) size of grid in asec AIPS 1: IMSIZE 4096 4096 Minimum image size AIPS 1: NFIELD 1 Number of fields (max. 512) AIPS 1: DO3DIMAG -1 > 0 => use different tangent AIPS 1: points for each field AIPS 1: FLDSIZE *all 0 Clean size of each field. AIPS 1: RASHIFT *all 0 RA shift per field (asec) AIPS 1: DECSHIFT *all 0 DEC shift per field (asec) AIPS 1: UVTAPER 0 0 (U,V) Gaussian taper AIPS 1: units are kilo-lambda AIPS 1: UVRANGE 0 0 Min & max baseline (klambda) AIPS 1: GUARD 0 0 x,y guard band fractional AIPS 1: radius AIPS 1: ROTATE 0 Rotate image CCW from N by AIPS 1: ROTATE degrees AIPS 1: ZEROSP *all 0 0-spacing fluxes and weights AIPS 1: SEE HELP!! AIPS 1: UVWTFN 'NA' UV dist. weight function AIPS 1: blank => uniform AIPS 1: UVSIZE 0 0 Array size for doing uniform AIPS 1: weights. 0 -> actual field AIPS 1: size. AIPS 1: ROBUST 0 Robustness power: -5 -> pure AIPS 1: uniform weights, 5 => natural AIPS 1: UVBOX 0 Additional rows and columns AIPS 1: used in weighting. AIPS 1: UVBXFN 1 Box function type when UVBOX AIPS 1: > 0. 0 -> 1 round pill box. AIPS 1: XTYPE 5 Conv. function type in x AIPS 1: default spheroidal AIPS 1: YTYPE 5 Conv. function type in y AIPS 1: default spheroidal AIPS 1: XPARM *all 0 Conv. function parms for x AIPS 1: YPARM *all 0 Conv. function parms for y AIPS 1: NITER 100 Maximum # of Clean components AIPS 1: BCOMP *all 0 Begin at BCOMP component AIPS 1: Specify for each field. AIPS 1: ALLOKAY 0 For restart: > 0 => beams AIPS 1: okay, > 1 => work file too AIPS 1: NBOXES 1 Number of boxes for Clean AIPS 1: NB: field 1 only. AIPS 1: CLBOX 2000 2000 Four coordinates for each box AIPS 1: 2096 2096 *rest 0 AIPS 1: BOXFILE *all ' ' Input file of field params AIPS 1: and Clean boxes; ' ' => use AIPS 1: FLDSIZE, RASHIFT, DECSHIFT, AIPS 1: NBOXES, CLBOX only. AIPS 1: OBOXFILE *all ' ' Output file for final Clean AIPS 1: boxes AIPS 1: GAIN 0.1 Clean loop gain AIPS 1: FLUX 0 Minimum Clean component (Jy) AIPS 1: MINPATCH 51 Min. BEAM half-width in AP. AIPS 1: BMAJ 1 FWHM(asec) major axis Clean AIPS 1: restoring beam. AIPS 1: BMIN 1 FWHM(asec) minor axis Clean AIPS 1: restoring beam. AIPS 1: BPA 0 Clean beam position angle AIPS 1: OVERLAP 0 1 => restore components to AIPS 1: overlapped fields, >=2=> AIPS 1: expect overlaps in Cleaning AIPS 1: PHAT 0 Prussian hat height. AIPS 1: FACTOR 0 Speedup factor see HELP AIPS 1: CMETHOD ' ' Modeling method: AIPS 1: 'DFT','GRID',' ' AIPS 1: IMAGRPRM *all 0 Task enrichment parameters AIPS 1: (1) Antenna diameter (m) AIPS 1: (2) Source Spectral index AIPS 1: (3) Frequency scaling factor AIPS 1: (4) > 0 -> SDI Clean factor AIPS 1: (5) >0 => scale residuals AIPS 1: (6) Half-width in x of box AIPS 1: (7) Half-width in y of box AIPS 1: (8) Filter components whose AIPS 1: neighborhood is weaker than AIPS 1: IMAGRPRM(8) Jy. 0 -> don't AIPS 1: (9) Radius in pixels for the AIPS 1: IMAGRPRM(8) test. AIPS 1: (10) multiplier of image size AIPS 1: to get beam size: 0 => 2; AIPS 1: 2, 1, 0.5 0.25 supported AIPS 1: (11-15) Multi-resolution AIPS 1: added controls AIPS 1: 0 -> no filtering. AIPS 1: NGAUSS 0 Number of resolutions to use AIPS 1: WGAUSS *all 0 Resolutions in arc sec >= 0 AIPS 1: MAXPIXEL 0 Maximum pixels searched in AIPS 1: each major cycle. AIPS 1: DOTV -1 Display residuals on TV ? AIPS 1: Start with field = DOTV AIPS 1: BADDISK *all 0 Disks to avoid for scratch. and then here are my settings on the restart clean. i kept the niter value purposefully low so i could determine if the restart clean considered the imported boxclean uv work file: AIPS 1: IMAGR: Wide field imaging/Clean task AIPS 1: Adverbs Values Comments AIPS 1: ---------------------------------------------------------------- AIPS 1: INNAME '0723+384 ' Input UV data (name) AIPS 1: INCLASS 'DOSORT' Input UV data (class) AIPS 1: INSEQ 1 Input UV data (seq. #) AIPS 1: INDISK 1 Input UV data disk drive # AIPS 1: SOURCES *all ' ' Source name AIPS 1: QUAL -1 Calibrator qualifier -1=>all AIPS 1: CALCODE ' ' Calibrator code ' '=>all AIPS 1: TIMERANG *all 0 Time range to use AIPS 1: SELBAND -1 Bandwidth to select (kHz) AIPS 1: SELFREQ -1 Frequency to select (MHz) AIPS 1: FREQID -1 Freq. ID to select. AIPS 1: SUBARRAY 0 Sub-array, 0=>all AIPS 1: DOCALIB -1 If >0 calibrate data AIPS 1: = 2 calibrate weights AIPS 1: GAINUSE 0 CL (or SN) table to apply AIPS 1: DOPOL -1 If >0.5 correct polarization. AIPS 1: BLVER -1 BL table to apply. AIPS 1: FLAGVER 0 Flag table version AIPS 1: DOBAND -1 If >0.5 apply bandpass cal. AIPS 1: Method used depends on value AIPS 1: of DOBAND (see HELP file). AIPS 1: BPVER -1 Bandpass table version AIPS 1: SMOOTH *all 0 Smoothing function. See AIPS 1: HELP SMOOTH for details. AIPS 1: STOKES ' ' Stokes parameters (see HELP) AIPS 1: BCHAN 1 Low freq. channel 0 for cont. AIPS 1: ECHAN 0 Highest freq channel AIPS 1: CHANNEL 0 Restart channel number AIPS 1: NPOINTS 1 Number of chan. to average. AIPS 1: CHINC 1 Channel incr. between maps. AIPS 1: BIF 0 First IF in average. AIPS 1: EIF 0 Last IF in average. AIPS 1: OUTNAME 'RSTRT723+384' Output image name (name) AIPS 1: OUTDISK 1 Output image disk drive # AIPS 1: OUTSEQ 3 Output seq. no. AIPS 1: OUTVER 1 CC ver. no (Continuum only) AIPS 1: *** SET OUTVER ON RESTARTS AIPS 1: IN2NAME '0723+384 ' UV work file name AIPS 1: IN2CLASS 'UVWORK' UV work file class AIPS 1: IN2SEQ 1 UV work file seq AIPS 1: *** SET TO KEEP WORK FILE AIPS 1: IN2DISK 1 UV work file disk AIPS 1: CELLSIZE 0.2 0.2 (X,Y) size of grid in asec AIPS 1: IMSIZE 4096 4096 Minimum image size AIPS 1: NFIELD 1 Number of fields (max. 512) AIPS 1: DO3DIMAG -1 > 0 => use different tangent AIPS 1: points for each field AIPS 1: FLDSIZE *all 0 Clean size of each field. AIPS 1: RASHIFT *all 0 RA shift per field (asec) AIPS 1: DECSHIFT *all 0 DEC shift per field (asec) AIPS 1: UVTAPER 0 0 (U,V) Gaussian taper AIPS 1: units are kilo-lambda AIPS 1: UVRANGE 0 0 Min & max baseline (klambda) AIPS 1: GUARD 0 0 x,y guard band fractional AIPS 1: radius AIPS 1: ROTATE 0 Rotate image CCW from N by AIPS 1: ROTATE degrees AIPS 1: ZEROSP *all 0 0-spacing fluxes and weights AIPS 1: SEE HELP!! AIPS 1: UVWTFN 'NA' UV dist. weight function AIPS 1: blank => uniform AIPS 1: UVSIZE 0 0 Array size for doing uniform AIPS 1: weights. 0 -> actual field AIPS 1: size. AIPS 1: ROBUST 0 Robustness power: -5 -> pure AIPS 1: uniform weights, 5 => natural AIPS 1: UVBOX 0 Additional rows and columns AIPS 1: used in weighting. AIPS 1: UVBXFN 1 Box function type when UVBOX AIPS 1: > 0. 0 -> 1 round pill box. AIPS 1: XTYPE 5 Conv. function type in x AIPS 1: default spheroidal AIPS 1: YTYPE 5 Conv. function type in y AIPS 1: default spheroidal AIPS 1: XPARM *all 0 Conv. function parms for x AIPS 1: YPARM *all 0 Conv. function parms for y AIPS 1: NITER 5 Maximum # of Clean components AIPS 1: BCOMP 100 *rest 0 Begin at BCOMP component AIPS 1: Specify for each field. AIPS 1: ALLOKAY 2 For restart: > 0 => beams AIPS 1: okay, > 1 => work file too AIPS 1: NBOXES 0 Number of boxes for Clean AIPS 1: NB: field 1 only. AIPS 1: CLBOX *all 0 Four coordinates for each box AIPS 1: BOXFILE *all ' ' Input file of field params AIPS 1: and Clean boxes; ' ' => use AIPS 1: FLDSIZE, RASHIFT, DECSHIFT, AIPS 1: NBOXES, CLBOX only. AIPS 1: OBOXFILE *all ' ' Output file for final Clean AIPS 1: boxes AIPS 1: GAIN 0.1 Clean loop gain AIPS 1: FLUX 0 Minimum Clean component (Jy) AIPS 1: MINPATCH 51 Min. BEAM half-width in AP. AIPS 1: BMAJ 1 FWHM(asec) major axis Clean AIPS 1: restoring beam. AIPS 1: BMIN 1 FWHM(asec) minor axis Clean AIPS 1: restoring beam. AIPS 1: BPA 0 Clean beam position angle AIPS 1: OVERLAP 0 1 => restore components to AIPS 1: overlapped fields, >=2=> AIPS 1: expect overlaps in Cleaning AIPS 1: PHAT 0 Prussian hat height. AIPS 1: FACTOR 0 Speedup factor see HELP AIPS 1: CMETHOD ' ' Modeling method: AIPS 1: 'DFT','GRID',' ' AIPS 1: IMAGRPRM *all 0 Task enrichment parameters AIPS 1: (1) Antenna diameter (m) AIPS 1: (2) Source Spectral index AIPS 1: (3) Frequency scaling factor AIPS 1: (4) > 0 -> SDI Clean factor AIPS 1: (5) >0 => scale residuals AIPS 1: (6) Half-width in x of box AIPS 1: (7) Half-width in y of box AIPS 1: (8) Filter components whose AIPS 1: neighborhood is weaker than AIPS 1: IMAGRPRM(8) Jy. 0 -> don't AIPS 1: (9) Radius in pixels for the AIPS 1: IMAGRPRM(8) test. AIPS 1: (10) multiplier of image size AIPS 1: to get beam size: 0 => 2; AIPS 1: 2, 1, 0.5 0.25 supported AIPS 1: (11-15) Multi-resolution AIPS 1: added controls AIPS 1: 0 -> no filtering. AIPS 1: NGAUSS 0 Number of resolutions to use AIPS 1: WGAUSS *all 0 Resolutions in arc sec >= 0 AIPS 1: MAXPIXEL 0 Maximum pixels searched in AIPS 1: each major cycle. AIPS 1: DOTV -1 Display residuals on TV ? AIPS 1: Start with field = DOTV AIPS 1: BADDISK *all 0 Disks to avoid for scratch. performing a restart clean with the above settings only succeeds in creating a map with a 5 niter clean over the entire map. the previous boxclean is not considered at all. thanks so much for your help, Brook Henkel