Opened 14 years ago
Closed 14 years ago
#108 closed defect (fixed)
uvspec frequency axis is inaccurate
| Reported by: | MarkWieringa | Owned by: | MarkWieringa |
|---|---|---|---|
| Priority: | major | Milestone: | |
| Component: | MIRIAD - CABB branch | Version: | |
| Keywords: | Cc: | ||
| Estimated Number of Hours: | 0 | Add Hours to Ticket: | 0 |
| Billable?: | yes | Total Hours: | 6 |
Description
It looks like the uvspec frequency labelling runs into problems at CABB zoom band resolution. 0.5kHz channel with GHz center freq means 10-7 resolution needed on freq axis, beyond single precision real.
Change History (1)
comment:1 Changed 14 years ago by
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
| Total Hours: | 0 → 6 |
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I've checked in a fix. When the frequency resolution gets too high or the axis range too small, it subtracts an appropriate offset before plotting. In the cases I've tried the axis=freq,amp and axis=chan,amp plots now look the same, but some tweaking may be needed to the tolerances for offset/no offset plotting to cover all cases.