Sleepyhead question

How does one interpret the "By Pressure" waveform? I understand the top line displays minutes at the various pressures for the whole night or whatever time frame is selected. I don't understand the meaning of the colored lines that rise and fall, again for the whole night or whatever time frame is selected. They seem to be color coordinated with the various events but the numbers under the various pressures don't seem to correlate with other data. The slope of the lines is displaying something but I'm not sure what it is.

On the virge wrote:How does one interpret the "By Pressure" waveform? I understand the top line displays minutes at the various pressures for the whole night or whatever time frame is selected. I don't understand the meaning of the colored lines that rise and fall, again for the whole night or whatever time frame is selected. They seem to be color coordinated with the various events but the numbers under the various pressures don't seem to correlate with other data. The slope of the lines is displaying something but I'm not sure what it is.

it's a work in progress... it was my idea, but it got twisted through the mind of a crazy australian programmer, and I never really have figured it out, other than the colors of the lines correspond to the colors called out in the detail pane on the left. I think....

Thank you.
Along the same line, recently I installed Encore Basic as a second view to Sleepyhead. I find it tantalizing but unsatisfying compared to Sleepyhead which I embrace. I compared the minutes at pressure for both programs (the By Pressure "waveform" in Sleepyhead and the Daily Events per hour matrix in Encore Basic's Therapy Details Report). The numbers are quite different. Since they are working with the same data, I would expect approximately the same numbers. The following shows several days earlier this month. I can see this difference leading to different values for the median pressure, the 90% pressure value, etc. Does anyone have any ideas?

On the virge wrote:Along the same line, recently I installed Encore Basic as a second view to Sleepyhead. I find it tantalizing but unsatisfying compared to Sleepyhead which I embrace.... The numbers are quite different. Since they are working with the same data, I would expect approximately the same numbers.

rounding differences? mark wasn't trying to duplicate the encore chart with what he came up with in SH.

also, encore is for hard core masochists

First, I forgot to say earlier that I really like the By Pressure Presentation and the way one can see numerically the pressure distribution dynamically as the "window" is changed and moved.
With respect to the differences, I don't think it is classic rounding because the differences are large for example on Feb 6th. However, rounding could be involved in the way time is "distributed" to the pressure bins. Since no time is allocated to the ramp period (less than 8 on the chart) and since the total minutes equals the total system time, there is some formula being applied that allocates that ramp time. Perhaps that is where the two approaches differ.
I wonder because it should change the value of the 90 pressure figure.