minor bug fixes in angle-scan import and documentation

- find attributes of region scans in angle-scan panel
- more detailed description of reduced import with regions

pearl/pearl-anglescan-panel.ipf

@@ -200,6 +200,12 @@ function asp_import_raw(raw_data)
 	dfref saveDF = GetDataFolderDFR()
 	dfref datadf = GetWavesDataFolderDFR(raw_data)
 	dfref attrdf = datadf:attr
+	if (!DataFolderRefStatus(attrdf))
+		setdatafolder datadf
+		setdatafolder ::
+		dfref parentdf = GetDataFolderDFR()
+		dfref attrdf = parentdf:attr
+	endif
 	setdatafolder $(package_path)
 	
 	// todo : check dimensions and scales
@@ -208,9 +214,20 @@ function asp_import_raw(raw_data)
 	source_path = GetWavesDataFolder(raw_data, 2)
 	
 	duplicate /o raw_data, raw, process_data
-	duplicate /o attrdf:ManipulatorTheta, raw_theta, process_theta
-	duplicate /o attrdf:ManipulatorTilt, raw_tilt, process_tilt
-	duplicate /o attrdf:ManipulatorPhi, raw_phi, process_phi
+	
+	wave /sdfr=attrdf /z ManipulatorTheta
+	wave /sdfr=attrdf /z ManipulatorTilt
+	wave /sdfr=attrdf /z ManipulatorPhi
+	if (WaveExists(ManipulatorTheta) && WaveExists(ManipulatorTilt) && WaveExists(ManipulatorPhi))
+		duplicate /o attrdf:ManipulatorTheta, raw_theta, process_theta
+		duplicate /o attrdf:ManipulatorTilt, raw_tilt, process_tilt
+		duplicate /o attrdf:ManipulatorPhi, raw_phi, process_phi
+	else
+		DoAlert 0, "Can't find manipulator angle waves.\rCheck that the attr folder exists, or provide values in the following table."
+		make /n=(dimsize(raw_data, 1)) /o raw_theta, raw_tilt, raw_phi
+		make /n=(dimsize(raw_data, 1)) /o process_theta, process_tilt, process_phi
+		edit /k=1 raw_theta, raw_tilt, raw_phi
+	endif
 	
 	make /o /n=(dimsize(raw_data, 0)) dist_x, dist_x_smoo
 	make /o /n=(dimsize(raw_data, 1)) dist_y, dist_y_smoo