IHW IR Filter Curves

Description:

Transmission curves for 7 infrared filter sets used during IHW are 
supplied. 

Data files consist of 2 columns : wavelength (usually) and transmission

Recommendations:

/data

First of all, many IR filter sets cannot adequately be described with a 
single letter used in the Files Table (summary –/data/files.tab): 
example: 7.8 micron “silicate” filter. L’ instead of L, etc. Need 4 
columns to do this.

Filter designations should match those used in the Filter Set Tables. In 
some cases, a letter was given, where it is not in the Filter Set Table 
(often just propagating the filter designation from filter lists earlier 
on)

Table 8: This is an L’ filter, not Q

Table 11-27: instrument is incorrectly labeled UKT7+UKT9 (UKIRT 
instrument). In the lbl file, no instrument is listed at all. Those 
shortward of 6 microns are RC1 INSB PHOT in the Infrared Filter Tables 
and those longward are GE BOLOMETER in the Infrared Filter Tables. Should 
indicate this in the LBL files after “Instrument:” as well as in the 
“files.tab” file.

Table 13-21: filter listed as Q, but are in fact 7.8, 8.7, 9.8, 10.3, 
11.6, 12.5, 18.1, 20.0, 21.7 – last 3 are delta lambda ~ 3 microns. These 
are the designations ACTUALLY USED in the photometry data tables.

Table 26 – L’, not L

Table 28-30: Comments from FITS Header: lists transmission as (0.0-1.0) 
but the table itself seems to be (0.0-100.0) in many cases

Table 31-33: Data in tab file and Comment in wavelength in nanometers, 
not microns

Table 36-46: Data in tab file and Comment in lbl are waveNUMBER, but 
header says wavelength. . Usually, is column 1 is in decreasing order – 
it is wavenumbes

Also:
 Table 36: 3.6 not K
 Table 37: 4.9 not K
 Table 38: 8.7 not K
 Table 40: 11.4 not N
 Table 41: 12.6 not N
 Table 42: 19.5 not N
 Table 43: Labeled : “8-14” but data is actually 7.6-19.0!!
 Table 44: 23 not N
 Table 45: 7.9 not N
 Table 46: Header lists “10.4”, which IS N. Okay but prefer designation 
           used in header

Add another column before the last one to list the filter set number as 
it appears in the Infrared Filter Table data base, so it is easy to know 
which sets are which.