CDO

Hi! I would like to reproduce Figure 2b in Hoskins and Hodges (2002). This Figure shows storm tracks derived from a 2-6 days bandpass filter applied to MSLP. I am new to the method, and not sure if I am doing everything correctly.
Input data: ERA-Interim, 6h, MLSP, 1980-1984
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1. (1) exclude 29 Feb:
   cdo del29feb erainterim_mslp_6h_19800101_19841231.nc tmp1.nc
2. (2) Use 2-6 days bandpass filter: fmin = 365/6, fmax = 365/2
   cdo -b F64 bandpass,61,183 tmp1.nc tmp2.nc
3. (3) Compute standard deviation
   cdo timstd tmp2.nc result.nc
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Questions:
(a) Is this approach correct? The file result.nc looks very similar to Figure 2b in Hoskins and Hodges (2002).
(b) Is the output from step 02 (tmp2.nc) pressure anomalies?

Thank you very much in advance!

Cheers,
Chris

Reference
Hoskins, B. J., & Hodges, K. I. (2002). New perspectives on the Northern Hemisphere winter storm tracks. Journal of the Atmospheric Sciences, 59(6), 1041-1061.