Changes between Version 12 and Version 13 of Ask_an_expert

Timestamp:

Aug 10, 2009, 2:31:31 PM (17 years ago)

Author:

pitts

Comment:

--

Ask_an_expert

@@ -116 +116 @@
 
  * How do I find out the exposure time for a given object, and/or the "effective" exposure time of a given average magnitude?
+
+    '''Answer from Mark Pitts:''' The keyword "exptime" can be used in mextract to pull out the exposure times for individual measurments. I'm not certain if there is an easy way to pull the "effective: exposure time of an average magnitude.
 
  * When I plot image outlines with 'images' and/or use gimages to find
@@ -156 +158 @@
    for an image, one for CMDs, and one for plotting objects in sky
    coordinates?
+
+    '''Answer from Mark Pitts:''' To open new graphics windows:
+
+        device -n (window name)
+
+        Without specifying a name, DVO with assign them numbers starting with zero. You also use this command to "activate" the window to plot or display stuff.
  
  * Assuming a local image mirror, we would like to do things like:
@@ -169 +177 @@
    on not 0,0 gives weird plot results
 
+    '''Answer from Mark Pitts:''' The region command accepts the position options as:
+
+        region (central RA) (central DEC) (radius); all units are in degrees
+
+        It may be that using a negative RA values caused the problem.
+
  * How do I make axis labels?
+
+    '''Answer from Mark Pitts:''' Using the labels command:
+
+        labels -x "x axis" -y "y axis"
+
+        This command can also add a title and place strings in the corners of the plot area.
 
 == ppImage ==